I have a requirement to create an auto-configuration for service call on spring-boot startup.
i.e., During spring-boot startup, the below service has to be called.
#PostMapping(path = "/addProduct", produces = "application/json", consumes = "application/json")
public #ResponseBody String addProduct(#RequestBody String productStr) {
..<My code>..
}
The add product requires an input like:
{
"product":"test",
"price":"10"
}
This will internally call a database service.
During startup, the json input provided in the console should be fed to this service.
I have no idea on how to achieve this. Verified a couple of Spring documentation. But those does'nt suit the requirement.
Kindly help in explaining a way or providing a right documentation to achieve this.
One way to do this is by implementing ApplicationRunner like this :
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.stereotype.Component;
#Component
public class ApplicationInitializer implements ApplicationRunner {
private ProductController productController;
public ApplicationInitializer(ProductController productController) {
this.productController = productController;
}
#Override
public void run(ApplicationArguments args) throws Exception {
String productArg = args.getOptionValues("product").get(0); // Assume that you will have only one product argument
ObjectMapper mapper = new ObjectMapper();
Product product = mapper.readValue(productArg, Product.class);
String response = productController.add(product);
System.out.println(response);
}
}
The run method will be invoked at startup with arguments passed in the command line like this : java -jar yourApp.jar --product="{\"name\":\"test\", \"price\":\"15\"}".
And you need a class to map the json to an object like this :
public class Product {
private String name;
private int price;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
}
You can also call your Controller using the RestTemplate (or WebClient) if needed :
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestTemplate;
#Component
public class ApplicationInitializer implements ApplicationRunner {
#Override
public void run(ApplicationArguments args) throws Exception {
String productArg = args.getOptionValues("product").get(0); // Assume that you will have only one product argument
ObjectMapper mapper = new ObjectMapper();
Product product = mapper.readValue(productArg, Product.class);
RestTemplate restTemplate = new RestTemplate();
String response = restTemplate.postForObject("http://localhost:8080/products", product, String.class);
System.out.println(response);
}
}
Such requirement can be achieved by using an init() method annotated with #PostConstruct in a bean.
e.g.
#Component
public class Foo {
#PostConstruct
public void init() {
//Call your service
}
}
I'm looking for the proper way—in a Jersey application—to read a header from an incoming request and automatically install it in any outgoing requests that might be made by a JAX-RS client that my application is using.
Ideally I'd like to do this without polluting any of my classes' inner logic at all, so via various filters and interceptors.
For simple use cases, I can do this: I have a ClientRequestFilter implementation that I register on my ClientBuilder, and that filter implementation has:
#Context
private HttpHeaders headers;
...which is a context-sensitive proxy (by definition), so in its filter method it can refer to headers that were present on the inbound request that's driving all this, and install them on the outgoing request. For straightforward cases, this appears to work OK.
However, this fails in the case of asynchronicity: if I use the JAX-RS asynchronous client APIs to spawn a bunch of GETs, the filter is still invoked, but can no longer invoke methods on that headers instance variable; Jersey complains that as far as it knows we're no longer in request scope. This makes sense if request scope is defined to be per-thread: the spawned GETs are running in some Jersey-managed thread pool somewhere, not on the same thread as the one with which the headers proxy is associated, so that proxy throws IllegalStateExceptions all over the place when my filter tries to talk to it.
I feel like there's some combination of ContainerRequestFilter and ClientRequestFilter that should be able to get the job done even in asynchronous cases, but I'm not seeing it.
What I would do is make a WebTarget injectable that is preconfigured with a ClientRequestFilter to add the headers. It's better to configure the WebTarget this way, as opposed to the Client, since the Client is an expensive object to create.
We can make the WebTarget injectable using a custom annotation and an InjectionResolver. In the InjectionResolver, we can get the ContainerRequest and get the headers from that, which we will pass to the ClientRequestFilter.
Here it is in action
Create the custom annotation
#Target({ElementType.FIELD})
#Retention(RetentionPolicy.RUNTIME)
public #interface WithHeadersTarget {
String baseUri();
String[] headerNames() default {};
}
Make the InjectionResolver with the custom ClientRequestFilter
private static class WithHeadersTargetInjectionResolver
implements InjectionResolver<WithHeadersTarget> {
private final Provider<ContainerRequest> requestProvider;
private final Client client;
#Inject
public WithHeadersTargetInjectionResolver(Provider<ContainerRequest> requestProvider) {
this.requestProvider = requestProvider;
this.client = ClientBuilder.newClient();
}
#Override
public Object resolve(Injectee injectee, ServiceHandle<?> handle) {
if (injectee.getRequiredType() == WebTarget.class
&& injectee.getParent().isAnnotationPresent(WithHeadersTarget.class)) {
WithHeadersTarget anno = injectee.getParent().getAnnotation(WithHeadersTarget.class);
String uri = anno.baseUri();
String[] headersNames = anno.headerNames();
MultivaluedMap<String, String> requestHeaders = requestProvider.get().getRequestHeaders();
return client.target(uri)
.register(new HeadersFilter(requestHeaders, headersNames));
}
return null;
}
#Override
public boolean isConstructorParameterIndicator() {
return false;
}
#Override
public boolean isMethodParameterIndicator() {
return false;
}
private class HeadersFilter implements ClientRequestFilter {
private final MultivaluedMap<String, String> headers;
private final String[] headerNames;
private HeadersFilter(MultivaluedMap<String, String> headers, String[] headerNames) {
this.headers = headers;
this.headerNames = headerNames;
}
#Override
public void filter(ClientRequestContext requestContext) throws IOException {
// if headers names is empty, add all headers
if (this.headerNames.length == 0) {
for (Map.Entry<String, List<String>> entry: this.headers.entrySet()) {
requestContext.getHeaders().put(entry.getKey(), new ArrayList<>(entry.getValue()));
}
// else just add the headers from the annotation
} else {
for (String header: this.headerNames) {
requestContext.getHeaders().put(header, new ArrayList<>(this.headers.get(header)));
}
}
}
}
}
One thing about this implementation is that it checks for an empty headerNames in the #WithHeadersTarget annotation. If it is empty, then we just forward all headers. If the user specifies some header names, then it will only forward those
Register the InjectionResolver
new ResourceConfig()
.register(new AbstractBinder() {
#Override
protected void configure() {
bind(WithHeadersTargetInjectionResolver.class)
.to(new TypeLiteral<InjectionResolver<WithHeadersTarget>>() {
}).in(Singleton.class);
}
})
Use it
#Path("test")
public static class TestResource {
#WithHeadersTarget(
baseUri = BASE_URI
headerNames = {TEST_HEADER_NAME})
private WebTarget target;
#GET
public String get() {
return target.path("client").request().get(String.class);
}
}
In this example if, the headerNames is left out, then it will default to an empty array, which will cause all the request headers to be forwarded.
Complete test using Jersey Test Framework
import org.glassfish.hk2.api.Injectee;
import org.glassfish.hk2.api.InjectionResolver;
import org.glassfish.hk2.api.ServiceHandle;
import org.glassfish.hk2.api.TypeLiteral;
import org.glassfish.hk2.utilities.binding.AbstractBinder;
import org.glassfish.jersey.filter.LoggingFilter;
import org.glassfish.jersey.server.ContainerRequest;
import org.glassfish.jersey.server.ResourceConfig;
import org.glassfish.jersey.test.JerseyTest;
import org.junit.Test;
import javax.inject.Inject;
import javax.inject.Provider;
import javax.inject.Singleton;
import javax.ws.rs.GET;
import javax.ws.rs.HeaderParam;
import javax.ws.rs.Path;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.ClientRequestContext;
import javax.ws.rs.client.ClientRequestFilter;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.Response;
import javax.ws.rs.ext.ExceptionMapper;
import java.io.IOException;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.logging.Logger;
import static org.assertj.core.api.Assertions.assertThat;
public class ForwardHeadersTest extends JerseyTest {
private static final String BASE_URI = "http://localhost:8000";
private static final String TEST_HEADER_NAME = "X-Test-Header";
#Target({ElementType.FIELD})
#Retention(RetentionPolicy.RUNTIME)
public #interface WithHeadersTarget {
String baseUri();
String[] headerNames() default {};
}
#Path("test")
public static class TestResource {
#WithHeadersTarget(
baseUri = BASE_URI
)
private WebTarget target;
#GET
public String get() {
return target.path("client").request().get(String.class);
}
}
#Path("client")
public static class ClientResource {
#GET
public String getReversedHeader(#HeaderParam(TEST_HEADER_NAME) String header) {
System.out.println(header);
return new StringBuilder(header).reverse().toString();
}
}
private static class WithHeadersTargetInjectionResolver
implements InjectionResolver<WithHeadersTarget> {
private final Provider<ContainerRequest> requestProvider;
private final Client client;
#Inject
public WithHeadersTargetInjectionResolver(Provider<ContainerRequest> requestProvider) {
this.requestProvider = requestProvider;
this.client = ClientBuilder.newClient();
}
#Override
public Object resolve(Injectee injectee, ServiceHandle<?> handle) {
if (injectee.getRequiredType() == WebTarget.class
&& injectee.getParent().isAnnotationPresent(WithHeadersTarget.class)) {
WithHeadersTarget anno = injectee.getParent().getAnnotation(WithHeadersTarget.class);
String uri = anno.baseUri();
String[] headersNames = anno.headerNames();
MultivaluedMap<String, String> requestHeaders = requestProvider.get().getRequestHeaders();
return client.target(uri)
.register(new HeadersFilter(requestHeaders, headersNames));
}
return null;
}
#Override
public boolean isConstructorParameterIndicator() {
return false;
}
#Override
public boolean isMethodParameterIndicator() {
return false;
}
private class HeadersFilter implements ClientRequestFilter {
private final MultivaluedMap<String, String> headers;
private final String[] headerNames;
private HeadersFilter(MultivaluedMap<String, String> headers, String[] headerNames) {
this.headers = headers;
this.headerNames = headerNames;
}
#Override
public void filter(ClientRequestContext requestContext) throws IOException {
// if headers names is empty, add all headers
if (this.headerNames.length == 0) {
for (Map.Entry<String, List<String>> entry: this.headers.entrySet()) {
requestContext.getHeaders().put(entry.getKey(), new ArrayList<>(entry.getValue()));
}
// else just add the headers from the annotation
} else {
for (String header: this.headerNames) {
requestContext.getHeaders().put(header, new ArrayList<>(this.headers.get(header)));
}
}
}
}
}
#Override
public ResourceConfig configure() {
return new ResourceConfig()
.register(TestResource.class)
.register(ClientResource.class)
.register(new AbstractBinder() {
#Override
protected void configure() {
bind(WithHeadersTargetInjectionResolver.class)
.to(new TypeLiteral<InjectionResolver<WithHeadersTarget>>() {
}).in(Singleton.class);
}
})
.register(new LoggingFilter(Logger.getAnonymousLogger(), true))
.register(new ExceptionMapper<Throwable>() {
#Override
public Response toResponse(Throwable t) {
t.printStackTrace();
return Response.serverError().entity(t.getMessage()).build();
}
});
}
#Override
public URI getBaseUri() {
return URI.create(BASE_URI);
}
#Test
public void testIt() {
final String response = target("test")
.request()
.header(TEST_HEADER_NAME, "HelloWorld")
.get(String.class);
assertThat(response).isEqualTo("dlroWolleH");
}
}
I am able to use REDIS and RABBITMQ services which is on pivotal.While binding services I am able to get the Credentials and using that credentials in my application.properties for spring boot project.
But this configuration that I am using is hard-coded in application.Properties
To Make this configuration dynamically I came to know that we can use vcap services provided by pivotal.
So want to use run-time credentials for redis and rabbimq.
My Code is below for reference.
application.propeties
rabbitmq.host=hostname
rabbitmq.virtual-host=vhostanme
rabbitmq.username=username
rabbitmq.password=password
rabbit.mainqueue=abhi
rabbit.errorqueue=abc
redis.host=redishostname
redis.port=port
redis.password=password
My Config class:
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
#Component
public class Config {
static String rabbitMqHost;
static String rabbitMqVHost;
static String rabbitMqUsername;
static String rabbitMqPassword;
static String rabbitMqMainQueue;
static String rabbitMqErrorQueue;
static String redisHost;
static int redisPort;
static String redisPassword;
Config() {
}
public static String getRedisHost() {
return redisHost;
}
public static void setRedisHost(String redisHost) {
Config.redisHost = redisHost;
}
public static int getRedisPort() {
return redisPort;
}
public static void setRedisPort(int redisPort) {
Config.redisPort = redisPort;
}
public static String getRedisPassword() {
return redisPassword;
}
public static void setRedisPassword(String redisPassword) {
Config.redisPassword = redisPassword;
}
public static String getRabbitMqMainQueue() {
return rabbitMqMainQueue;
}
public static void setRabbitMqMainQueue(String rabbitMqMainQueue) {
Config.rabbitMqMainQueue = rabbitMqMainQueue;
}
public static String getRabbitMqErrorQueue() {
return rabbitMqErrorQueue;
}
public static void setRabbitMqErrorQueue(String rabbitMqErrorQueue) {
Config.rabbitMqErrorQueue = rabbitMqErrorQueue;
}
public static String getRabbitMqHost() {
return rabbitMqHost;
}
public static void setRabbitMqHost(String rabbitMqHost) {
Config.rabbitMqHost = rabbitMqHost;
}
public static String getRabbitMqVHost() {
return rabbitMqVHost;
}
public static void setRabbitMqVHost(String rabbitMqVHost) {
Config.rabbitMqVHost = rabbitMqVHost;
}
public static String getRabbitMqUsername() {
return rabbitMqUsername;
}
public static void setRabbitMqUsername(String rabbitMqUsername) {
Config.rabbitMqUsername = rabbitMqUsername;
}
public static String getRabbitMqPassword() {
return rabbitMqPassword;
}
public static void setRabbitMqPassword(String rabbitMqPassword) {
Config.rabbitMqPassword = rabbitMqPassword;
}
#Value("${rabbitmq.host}")
public void setRabbitMqHosts(String url) {
setRabbitMqHost(url);
}
#Value("${rabbitmq.virtual-host}")
public void setRabbitMqVHosts(String url) {
setRabbitMqVHost(url);
}
#Value("${rabbitmq.username}")
public void setRabbitUsernames(String url) {
setRabbitMqUsername(url);
}
#Value("${rabbitmq.password}")
public void setRabbitPasswords(String url) {
setRabbitMqPassword(url);
}
#Value("${rabbit.mainqueue}")
public void setRabbitMainQueues(String url) {
setRabbitMqMainQueue(url);
}
#Value("${rabbit.errorqueue}")
public void setRabbitErrorQueues(String url) {
setRabbitMqErrorQueue(url);
}
#Value("${redis.host}")
public void setRedisHosts(String url) {
setRedisHost(url);
}
#Value("${redis.port}")
public void setRedisPorts(int url) {
setRedisPort(url);
}
#Value("${redis.password}")
public void setRedisPasswords(String url) {
setRedisPassword(url);
}
}
My MessagesConsumer class in which I am using that Conguration to take message from rabbitmq jms queue and save to redis:
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.annotation.PostConstruct;
import javax.jms.ConnectionFactory;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.Session;
import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.jms.core.JmsTemplate;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import com.es.consumer.config.Config;
import com.rabbitmq.jms.admin.RMQConnectionFactory;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisShardInfo;
#Component
public class MessagesConsumer {
#Autowired
JmsTemplate jmsTemplate;
final Logger logger = LoggerFactory.getLogger(MessagesConsumer.class);
Jedis jedis;
JedisShardInfo shardInfo;
#PostConstruct
public void init() {
shardInfo = new JedisShardInfo(Config.getRedisHost(), Config.getRedisPort());
shardInfo.setPassword(Config.getRedisPassword());
jedis = new Jedis(shardInfo);
jedis.connect();
jedis.select(2);
}
#Bean
ConnectionFactory connectionFactory() {
RMQConnectionFactory connectionFactory = new RMQConnectionFactory();
connectionFactory.setUsername(Config.getRabbitMqUsername());
connectionFactory.setPassword(Config.getRabbitMqPassword());
connectionFactory.setVirtualHost(Config.getRabbitMqVHost());
connectionFactory.setHost(Config.getRabbitMqHost());
return connectionFactory;
}
#SuppressWarnings("rawtypes")
#Scheduled(fixedRate = 1)
public void readQueueAndSaveData() {
// take message process it and save to redis as hmset
}}
Any Help would be appreciable.
There are two ways of doing this.
1) Remove all the properties from application.properties, and write a configuration bean that will create RedisTemplate and RabbitTemplate beans for you. The factory properties required for these are to be obtained from the VCAP_SERVICES. On CF, the VCAP_SERVICES env variable, will have the services information that are binded to the app. When u push the app, with redis, rabbit service binded into your space, then their properties are available in VCAP_SERVICES. So just do System.getEnv("VCAP_SERVICES") in your code and then parse the json to get the service details to create the templates.
2) Remove the properties from application.properties, and use spring cloud connector. Spring cloud has a subproject called Spring cloud connectors that provide utilities to connect to various cloud services.
http://cloud.spring.io/spring-cloud-connectors/spring-cloud-spring-service-connector.html#_rabbitmq
Just you need to define a class that extends AbstractCloudConfig as below
class CloudConfig extends AbstractCloudConfig {
#Bean
public RabbitConnectionFactory rabbitFactory() {
return connectionFactory().rabbitConnectionFactory("rabbit-servicename");
}
#Bean
public RedisConnectionFactory redisFactory() {
return connectionFactory().redisConnectionFactory("redis-servicename");
}
}
The second approach is prefered if you are using Spring, as this needs very less coding and can be switched, to different cloud providers with no much effort.
My requirement is as given below :
"we have a load a big properties file using Spring and then loop through it .
While looping we have to check the very first column of properties file for some particular values.
As soon as we find those values we have to print that value and continue this printing process till the very end."
For this i finally able to build a code like below :
import java.util.Map;
import java.util.Properties;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class SpringPropertiesUtil extends PropertyPlaceholderConfigurer {
private static Map<String, String> propertiesMap;
private static String keyToFind = "myProperty";
// Default as in PropertyPlaceholderConfigurer
private int springSystemPropertiesMode = SYSTEM_PROPERTIES_MODE_FALLBACK;
#Override
public void setSystemPropertiesMode(int systemPropertiesMode) {
super.setSystemPropertiesMode(systemPropertiesMode);
springSystemPropertiesMode = systemPropertiesMode;
}
#Override
protected void processProperties(ConfigurableListableBeanFactory beanFactory, Properties props) throws BeansException {
super.processProperties(beanFactory, props);
for (Object key : props.keySet()) {
String keyStr = key.toString();
if(keyStr.equals(keyToFind)) {
String valueStr = resolvePlaceholder(keyStr, props, springSystemPropertiesMode);
System.out.println(valueStr);
}
}
}
public String getProperty(String name) {
return propertiesMap.get(name).toString();
}
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
((ConfigurableApplicationContext)context).close();
}
}
It is working fine but i am finding a nicer way of doing this if i can overload processProperties() and can pass String keyTofind to this method rather than defining it globally.
Any suggestion is welcome.
Thanks.
Alternatively to your solution, you could implement a custom property source. I believe this is the mechanism Spring has intended for proprietary "source parsing logic".
The subject is not terribly well documented on the web, but this article gives some insight: http://scottfrederick.cfapps.io/blog/2012/05/22/Custom-PropertySource-in-Spring-3.1---Part-1/
We use the code below to inject Spring beans with properties from a properties file.
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations" value="classpath:/my.properties"/>
</bean>
<bean id="blah" class="abc">
<property name="path" value="${the.path}"/>
</bean>
Is there a way we can access the properties programmatically? I'm trying to do some code without dependency injection. So I'd like to just have some code like this:
PropertyPlaceholderConfigurer props = new PropertyPlaceholderConfigurer();
props.load("classpath:/my.properties");
props.get("path");
How about PropertiesLoaderUtils?
Resource resource = new ClassPathResource("/my.properties");
Properties props = PropertiesLoaderUtils.loadProperties(resource);
If all you want to do is access placeholder value from code, there is the #Value annotation:
#Value("${settings.some.property}")
String someValue;
To access placeholders From SPEL use this syntax:
#('${settings.some.property}')
To expose configuration to views that have SPEL turned off, one can use this trick:
package com.my.app;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.stereotype.Component;
#Component
public class PropertyPlaceholderExposer implements Map<String, String>, BeanFactoryAware {
ConfigurableBeanFactory beanFactory;
#Override
public void setBeanFactory(BeanFactory beanFactory) {
this.beanFactory = (ConfigurableBeanFactory) beanFactory;
}
protected String resolveProperty(String name) {
String rv = beanFactory.resolveEmbeddedValue("${" + name + "}");
return rv;
}
#Override
public String get(Object key) {
return resolveProperty(key.toString());
}
#Override
public boolean containsKey(Object key) {
try {
resolveProperty(key.toString());
return true;
}
catch(Exception e) {
return false;
}
}
#Override public boolean isEmpty() { return false; }
#Override public Set<String> keySet() { throw new UnsupportedOperationException(); }
#Override public Set<java.util.Map.Entry<String, String>> entrySet() { throw new UnsupportedOperationException(); }
#Override public Collection<String> values() { throw new UnsupportedOperationException(); }
#Override public int size() { throw new UnsupportedOperationException(); }
#Override public boolean containsValue(Object value) { throw new UnsupportedOperationException(); }
#Override public void clear() { throw new UnsupportedOperationException(); }
#Override public String put(String key, String value) { throw new UnsupportedOperationException(); }
#Override public String remove(Object key) { throw new UnsupportedOperationException(); }
#Override public void putAll(Map<? extends String, ? extends String> t) { throw new UnsupportedOperationException(); }
}
And then use the exposer to expose properties to a view:
<bean class="org.springframework.web.servlet.view.UrlBasedViewResolver" id="tilesViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.tiles2.TilesView"/>
<property name="attributesMap">
<map>
<entry key="config">
<bean class="com.my.app.PropertyPlaceholderExposer" />
</entry>
</map>
</property>
</bean>
Then in view, use the exposed properties like this:
${config['settings.some.property']}
This solution has the advantage that you can rely on standard placeholder
implementation injected by the context:property-placeholder tag.
Now as a final note, if you really need a to capture all placeholder properties and their values, you have to pipe them through StringValueResolver to make sure that placeholders work inside the property values as expected. The following code will do that.
package com.my.app;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
import org.springframework.util.StringValueResolver;
public class AppConfig extends PropertyPlaceholderConfigurer implements Map<String, String> {
Map<String, String> props = new HashMap<String, String>();
#Override
protected void processProperties(ConfigurableListableBeanFactory beanFactory, Properties props)
throws BeansException {
this.props.clear();
for (Entry<Object, Object> e: props.entrySet())
this.props.put(e.getKey().toString(), e.getValue().toString());
super.processProperties(beanFactory, props);
}
#Override
protected void doProcessProperties(ConfigurableListableBeanFactory beanFactoryToProcess,
StringValueResolver valueResolver) {
super.doProcessProperties(beanFactoryToProcess, valueResolver);
for(Entry<String, String> e: props.entrySet())
e.setValue(valueResolver.resolveStringValue(e.getValue()));
}
// Implement map interface to access stored properties
#Override public Set<String> keySet() { return props.keySet(); }
#Override public Set<java.util.Map.Entry<String, String>> entrySet() { return props.entrySet(); }
#Override public Collection<String> values() { return props.values(); }
#Override public int size() { return props.size(); }
#Override public boolean isEmpty() { return props.isEmpty(); }
#Override public boolean containsValue(Object value) { return props.containsValue(value); }
#Override public boolean containsKey(Object key) { return props.containsKey(key); }
#Override public String get(Object key) { return props.get(key); }
#Override public void clear() { throw new UnsupportedOperationException(); }
#Override public String put(String key, String value) { throw new UnsupportedOperationException(); }
#Override public String remove(Object key) { throw new UnsupportedOperationException(); }
#Override public void putAll(Map<? extends String, ? extends String> t) { throw new UnsupportedOperationException(); }
}
I have done this and it has worked.
Properties props = PropertiesLoaderUtils.loadAllProperties("my.properties");
PropertyPlaceholderConfigurer props2 = new PropertyPlaceholderConfigurer();
props2.setProperties(props);
That should work.
CREDIT: Programmatic access to properties in Spring without re-reading the properties file
I've found a nice implementation of accessing the properties programmatically in spring without reloading the same properties that spring has already loaded. [Also, It is not required to hardcode the property file location in the source]
With these changes, the code looks cleaner & more maintainable.
The concept is pretty simple. Just extend the spring default property placeholder (PropertyPlaceholderConfigurer) and capture the properties it loads in the local variable
public class SpringPropertiesUtil extends PropertyPlaceholderConfigurer {
private static Map<String, String> propertiesMap;
// Default as in PropertyPlaceholderConfigurer
private int springSystemPropertiesMode = SYSTEM_PROPERTIES_MODE_FALLBACK;
#Override
public void setSystemPropertiesMode(int systemPropertiesMode) {
super.setSystemPropertiesMode(systemPropertiesMode);
springSystemPropertiesMode = systemPropertiesMode;
}
#Override
protected void processProperties(ConfigurableListableBeanFactory beanFactory, Properties props) throws BeansException {
super.processProperties(beanFactory, props);
propertiesMap = new HashMap<String, String>();
for (Object key : props.keySet()) {
String keyStr = key.toString();
String valueStr = resolvePlaceholder(keyStr, props, springSystemPropertiesMode);
propertiesMap.put(keyStr, valueStr);
}
}
public static String getProperty(String name) {
return propertiesMap.get(name).toString();
}
}
Usage Example
SpringPropertiesUtil.getProperty("myProperty")
Spring configuration changes
<bean id="placeholderConfigMM" class="SpringPropertiesUtil">
<property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE"/>
<property name="locations">
<list>
<value>classpath:myproperties.properties</value>
</list>
</property>
</bean>
Hope this helps to solve the problems you have
You can also use either the spring utils, or load properties via the PropertiesFactoryBean.
<util:properties id="myProps" location="classpath:com/foo/myprops.properties"/>
or:
<bean id="myProps" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<property name="location" value="classpath:com/foo/myprops.properties"/>
</bean>
Then you can pick them up in your application with:
#Resource(name = "myProps")
private Properties myProps;
and additionally use these properties in your config:
<context:property-placeholder properties-ref="myProps"/>
This is also in the docs: http://docs.spring.io/spring/docs/current/spring-framework-reference/htmlsingle/#xsd-config-body-schemas-util-properties
Create a class like below
package com.tmghealth.common.util;
import java.util.Properties;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;
#Component
#Configuration
#PropertySource(value = { "classpath:/spring/server-urls.properties" })
public class PropertiesReader extends PropertyPlaceholderConfigurer {
#Override
protected void processProperties(
ConfigurableListableBeanFactory beanFactory, Properties props)
throws BeansException {
super.processProperties(beanFactory, props);
}
}
Then wherever you want to access a property use
#Autowired
private Environment environment;
and getters and setters then access using
environment.getProperty(envName
+ ".letter.fdi.letterdetails.restServiceUrl");
-- write getters and setters in the accessor class
public Environment getEnvironment() {
return environment;
}`enter code here`
public void setEnvironment(Environment environment) {
this.environment = environment;
}
You can get your properties through Environment class. As documentation stands:
Properties play an important role in almost all applications, and may originate from a variety of sources: properties files, JVM system properties, system environment variables, JNDI, servlet context parameters, ad-hoc Properties objects, Maps, and so on. The role of the environment object with relation to properties is to provide the user with a convenient service interface for configuring property sources and resolving properties from them.
Having Environment as a env variable, simply call:
env.resolvePlaceholders("${your-property:default-value}")
You can get your 'raw' properties through:
env.getProperty("your-property")
It will search through all properties source that spring has registered.
You can either obtain Environment through:
inject ApplicationContext by implementing ApplicationContextAware and then call getEnvironment() on context
implement EnvironmentAware.
It's obtain through implementation of a class because properties are resolved on early stage of application startup, as they may be required for bean construction.
Read more on documentation: spring Environment documentation
As you know the newer versions of Spring don't use the PropertyPlaceholderConfigurer and now use another nightmarish construct called PropertySourcesPlaceholderConfigurer. If you're trying to get resolved properties from code, and wish the Spring team gave us a way to do this a long time ago, then vote this post up! ... Because this is how you do it the new way:
Subclass PropertySourcesPlaceholderConfigurer:
public class SpringPropertyExposer extends PropertySourcesPlaceholderConfigurer {
private ConfigurableListableBeanFactory factory;
/**
* Save off the bean factory so we can use it later to resolve properties
*/
#Override
protected void processProperties(ConfigurableListableBeanFactory beanFactoryToProcess,
final ConfigurablePropertyResolver propertyResolver) throws BeansException {
super.processProperties(beanFactoryToProcess, propertyResolver);
if (beanFactoryToProcess.hasEmbeddedValueResolver()) {
logger.debug("Value resolver exists.");
factory = beanFactoryToProcess;
}
else {
logger.error("No existing embedded value resolver.");
}
}
public String getProperty(String name) {
Object propertyValue = factory.resolveEmbeddedValue(this.placeholderPrefix + name + this.placeholderSuffix);
return propertyValue.toString();
}
}
To use it, make sure to use your subclass in your #Configuration and save off a reference to it for later use.
#Configuration
#ComponentScan
public class PropertiesConfig {
public static SpringPropertyExposer commonEnvConfig;
#Bean(name="commonConfig")
public static PropertySourcesPlaceholderConfigurer commonConfig() throws IOException {
commonEnvConfig = new SpringPropertyExposer(); //This is a subclass of the return type.
PropertiesFactoryBean commonConfig = new PropertiesFactoryBean();
commonConfig.setLocation(new ClassPathResource("META-INF/spring/config.properties"));
try {
commonConfig.afterPropertiesSet();
}
catch (IOException e) {
e.printStackTrace();
throw e;
}
commonEnvConfig.setProperties(commonConfig.getObject());
return commonEnvConfig;
}
}
Usage:
Object value = PropertiesConfig.commonEnvConfig.getProperty("key.subkey");
This help me:
ApplicationContextUtils.getApplicationContext().getEnvironment()
Here is another sample .
XmlBeanFactory factory = new XmlBeanFactory(new FileSystemResource("beans.xml"));
PropertyPlaceholderConfigurer cfg = new PropertyPlaceholderConfigurer();
cfg.setLocation(new FileSystemResource("jdbc.properties"));
cfg.postProcessBeanFactory(factory);
This will resolve any nested properties.
public class Environment extends PropertyPlaceholderConfigurer {
/**
* Map that hold all the properties.
*/
private Map<String, String> propertiesMap;
/**
* Iterate through all the Property keys and build a Map, resolve all the nested values before building the map.
*/
#Override
protected void processProperties(ConfigurableListableBeanFactory beanFactory, Properties props) throws BeansException {
super.processProperties(beanFactory, props);
propertiesMap = new HashMap<String, String>();
for (Object key : props.keySet()) {
String keyStr = key.toString();
String valueStr = beanFactory.resolveEmbeddedValue(placeholderPrefix + keyStr.trim() + DEFAULT_PLACEHOLDER_SUFFIX);
propertiesMap.put(keyStr, valueStr);
}
}
/**
* This method gets the String value for a given String key for the property files.
*
* #param name - Key for which the value needs to be retrieved.
* #return Value
*/
public String getProperty(String name) {
return propertiesMap.get(name).toString();
}
This post also explatis howto access properties: http://maciej-miklas.blogspot.de/2013/07/spring-31-programmatic-access-to.html
You can access properties loaded by spring property-placeholder over such spring bean:
#Named
public class PropertiesAccessor {
private final AbstractBeanFactory beanFactory;
private final Map<String,String> cache = new ConcurrentHashMap<>();
#Inject
protected PropertiesAccessor(AbstractBeanFactory beanFactory) {
this.beanFactory = beanFactory;
}
public String getProperty(String key) {
if(cache.containsKey(key)){
return cache.get(key);
}
String foundProp = null;
try {
foundProp = beanFactory.resolveEmbeddedValue("${" + key.trim() + "}");
cache.put(key,foundProp);
} catch (IllegalArgumentException ex) {
// ok - property was not found
}
return foundProp;
}
}
This is the finest way I got it to work:
package your.package;
import java.io.IOException;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PropertiesLoaderUtils;
public class ApplicationProperties {
private Properties properties;
public ApplicationProperties() {
// application.properties located at src/main/resource
Resource resource = new ClassPathResource("/application.properties");
try {
this.properties = PropertiesLoaderUtils.loadProperties(resource);
} catch (IOException ex) {
Logger.getLogger(ApplicationProperties.class.getName()).log(Level.SEVERE, null, ex);
}
}
public String getProperty(String propertyName) {
return this.properties.getProperty(propertyName);
}
}
create .properties file in classpath of your project and add path configuration in xml`<context:property-placeholder location="classpath*:/*.properties" />`
in servlet-context.xml after that u can directly use your file everywhere
Please use the below code in your spring configuration file to load the file from class path of your application
<context:property-placeholder
ignore-unresolvable="true" ignore-resource-not-found="false" location="classpath:property-file-name" />
I know this is an old thread, however, this topic in my opinion becomes of great importance for those using the functional approach for all those usecases where you need a microservice that loads "instantly" and therefore you avoid using annotations.
The problem that remained unsolved was to load eventually the environment variables which I had in my application.yml.
public class AppPropsLoader {
public static Properties load() {
var propPholderConfig = new PropertySourcesPlaceHolderConfigurer();
var yaml = new YamlPropertiesFactoryBean();
ClassPathResource resource = new ClassPathResource("application.yml");
Objects.requireNonNull(resource, "File application.yml does not exist");
yaml.setResources(resource);
Objects.requireNonNull(yaml.getObject(), "Configuration cannot be null");
propPholderConfig.postProcessBeanFactory(new DefaultListableBeanFactory());
propPholderConfig.setProperties(yaml.getObject());
PropertySources appliedPropertySources =
propPholderConfig.getAppliedPropertySources();
var resolver = new PropertySourcesPlaceholderResolver(appliedPropertySources);
Properties resolvedProps = new Properties();
for (Map.Entry<Object, Object> prop: yaml.getObject().entrySet()) {
resolvedProps.setProperty((String)prop.getKey(),
getPropertyValue(resolver.resolvePlaceHolders(prop.getValue()));
}
return resolvedProps;
}
static String getPropertyValue(Object prop) {
var val = String.valueOf(prop);
Pattern p = Pattern.compile("^(\\$\\{)([a-zA-Z0-9-._]+)(\\})$");
Matcher m = p.matcher(val);
if(m.matches()) {
return System.getEnv(m.group(2));
}
return val;
}
}