I been trying to find a example of how to do multiple file upload in Spring MVC without using XML only Java Config. So far have found nothing and a lot of people that just either want hits to sites or don't know what java configuration v xml configuration is.
I don't use Spring Boot and don't want to as I want to learn this framework no matter how difficult.
Even advice on how to convert the following line to java config would be appreciated:
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="1000000" />
</bean>
Please do advise also what JARs i would need for the above multipartResolver.
Thanks a bunch gang
That line translates to
#Bean
public MultipartResolver multipartResolver() {
org.springframework.web.multipart.commons.CommonsMultipartResolver multipartResolver = new org.springframework.web.multipart.commons.CommonsMultipartResolver();
multipartResolver.setMaxUploadSize(1000000);
return multipartResolver;
}
Within a #Configuration class which you'd load in your Servlet context.
You need commons-fileupload library for this to work.
Related
I would like to ask for explanation of Spring configuration types?
Here is what I know but I am confused by what I have found here on stack and other places.
XML based configuration
Java based configuration
Annotation based configuration (this is what I am interested about)
I have read a lot of articles or opinions that there are basically only two configuration options (XML and Java). So what is wrong when I consider Annotation based config as a third option? I asssume that this option is available only when I use XML based configuration using:
<context:annotation-config/>
So is that why some people does not consider Annotation based config as a third options because it is dependent on XML (or Java) config?
I have one more questions:
Can I use Annotation approach by using Java based configuration? I was not able to find how to enable it using Java. (maybe using #EnableAutoConfiguration??)
I consider this scenario using Spring Core. When we are talking about SpringBoot I assume there is Annotation config enabled by default in #SpringBootApplication annotation?
Thank you!
You are right in the general sense, I refer you to this small section in the official docs for spring [https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/context/annotation/Configuration.html]
Here you will see an example of using XML configurations using the
<beans>
<context:annotation-config/>
<bean class="com.acme.AppConfig"/>
</beans>
and JAVA spring component scanning
#Configuration
public class AppConfig {
private final SomeBean someBean;
public AppConfig(SomeBean someBean) {
this.someBean = someBean;
}
// #Bean definition using "SomeBean"
}
You are also right about springboot #SpringBootApplication I contains #Configuration, #ComponentScan and #EnableAutoConfiguration to scan and configure your beans
I have modified my original question slightly to better reflect my question. I have a non-Spring Boot application that I would like to have working with the Spring Cloud Config Server. I have searched around online and tried many things but it seems like the crux of my issue is that the server only works within a Spring Boot context. Although ActiveMQ is a Spring application already, it seems non-trivial to convert it to be a Spring Boot one.
I would like to have an ActiveMQ Broker that is configured from the Spring Cloud Config. My local settings within the application.properties should be replaced by those that come from the server. This works in other servers I work on, now I need it to work for my Broker Filter plugins.
I added the following to activemq.xml:
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:application.properties</value>
<value>file:${activemq.conf}/credentials.properties</value>
</list>
</property>
</bean>
NOTE: Several base packages omitted here but are similar to:
<context:component-scan base-package="org.springframework.cloud.bootstrap"/>
<!-- enables annotation based configuration -->
<context:annotation-config />
After doing so I was able to get various #Value annotations to work with settings coming from my application.properties but the whole Spring Cloud Config Server thing seems to not replace my local application.properties file settings. Other Spring Boot application I work on do so I know the server is fine.
I have added the following jars to the apache-activemq-5.12.0\lib\extra directory:
spring-aop-4.1.8.RELEASE.jar
spring-beans-4.1.8.RELEASE.jar
spring-boot-1.2.7.RELEASE.jar
spring-boot-actuator-1.2.7.RELEASE.jar
spring-boot-autoconfigure-1.2.7.RELEASE.jar
spring-boot-starter-1.2.7.RELEASE.jar
spring-boot-starter-actuator-1.2.7.RELEASE.jar
spring-boot-starter-data-mongodb-1.2.7.RELEASE.jar
spring-boot-starter-logging-1.2.7.RELEASE.jar
spring-cloud-commons-1.0.1.RELEASE.jar
spring-cloud-config-client-1.0.1.RELEASE.jar
spring-cloud-context-1.0.1.RELEASE.jar
spring-cloud-starter-1.0.1.RELEASE.jar
spring-cloud-starter-config-1.0.1.RELEASE.jar
spring-context-4.1.8.RELEASE.jar
spring-context-support-4.1.8.RELEASE.jar
spring-core-4.1.8.RELEASE.jar
spring-data-commons-1.11.0.RELEASE.jar
spring-data-mongodb-1.8.0.RELEASE.jar
spring-expression-4.1.8.RELEASE.jar
spring-jms-4.1.8.RELEASE.jar
spring-security-crypto-3.2.8.RELEASE.jar
spring-test-4.1.8.RELEASE.jar
spring-tx-4.1.8.RELEASE.jar
spring-web-4.1.8.RELEASE.jar
refreshendpoint is not necessarily initialized when the constructor is called. You need to add a method annotation with #PostConstruct (or implement InitializingBean and implement afterPropertiesSet method) in which you'll perform refreshendpoint.refresh(); , e.g:
#PostConstruct
void init() {
refreshendpoint.refresh();
}
I am installing Activiti 5.17.0's Activiti Explorer and would like to use a JNDI-based datasource configuration to connect to an Oracle DB. The documentation I found here: http://www.activiti.org/userguide/#jndiDatasourceConfig is very explicit about making this change but unfortunately the docs seems to be obsolete.
In particular, I found no activiti-standalone-context.xml and no activiti-context.xml at the mentioned places. I assume it got changed to activiti-custom-context.xml, but the whole content of this Spring configuration is commented out (which makes me wonder where the actual Spring config might come from).
I tried to configure the datasource in this file anyway using this approach:
<jee:jndi-lookup id="dataSource"
jndi-name="jdbc/activiti-ds"
expected-type="javax.sql.DataSource" />
and this approach as well:
<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
<property name="proxyInterface" value="javax.sql.DataSource"/>
<property name="jndiName"><value>jdbc/activiti-ds</value></property>
</bean>
but both my attempts ended up in the same ClassCastException, claiming that the generated Proxy class is not an instance of javax.sql.DataSource:
java.lang.ClassCastException: org.springframework.jndi.JndiObjectFactoryBean$$EnhancerBySpringCGLIB$$69ba43af cannot be cast to javax.sql.DataSource
at org.activiti.explorer.conf.ActivitiEngineConfiguration$$EnhancerBySpringCGLIB$$5db7207e.dataSource(<generated>)
at org.activiti.explorer.conf.ActivitiEngineConfiguration.processEngineConfiguration(ActivitiEngineConfiguration.java:91)
Any hints how to accomplish to this task? Maybe a pointer to an up-to-date documentation?
For further reference, I solved the problem by editing the Spring JavaConfig in ActivitiEngineConfiguration.java and replacing the dataSource bean creation there with the following code:
#Bean
public DataSource dataSource() {
final JndiDataSourceLookup dsLookup = new JndiDataSourceLookup();
dsLookup.setResourceRef(true);
DataSource dataSource = dsLookup.getDataSource("jdbc/activiti-ds");
return dataSource;
}
After recompiling the module and deploying, it seems to work flawlessly.
Thanks a lot to Greg Harley above whose questions and commented helped to solve the problem!
The Activiti users guide includes updated instructions for how to configure a JDBC datasource here: http://www.activiti.org/userguide/#jndiDatasourceConfig
You will need to configure a datasource bean in the ActivitiEngineConfiguration class of your web application and update the following line of code to reference your new datasource:
processEngineConfiguration.setDataSource(dataSource());
If you want to continue to use the Spring XML configuration, you can still define your custom beans in the activiti-custom-context.xml.
I have got Spring RestController classes to handle rest services using JSON. For JSON I am using Jackson. There are fields of java.util.Optional type
private Optional<Long> start = Optional.empty();
To enable the handling of Optional type, I am configuring the Spring as follows
<bean id="objectMapper" class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
<property name="modulesToInstall" value="com.fasterxml.jackson.datatype.jdk8.Jdk8Module" />
</bean>
However when I call the webservice, it fails in deserializing the Optional types with following message
org.springframework.http.converter.HttpMessageNotReadableException:
Could not read JSON: Can not instantiate value of type
[simple type, class java.util.Optional<java.lang.Long>]
from Long integral number (3424323423432); no
single-long-arg constructor/factory method
Doing serialization/deserialization from stand alone code works fine. There I register the module directly using the following code
ObjectMapper m = new ObjectMapper();
m.registerModule(new Jdk8Module());
Versions I am using:
Spring : 4.1.5.RELEASE
Jackson: 2.5.1
Thanks in advance
I could figure out this. The solution is to register the object mapper to Message converter as follows
<mvc:annotation-driven>
<mvc:message-converters>
<bean
class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="objectMapper" ref="objectMapper" />
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
<bean id="objectMapper" class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
<property name="modulesToInstall"
value="com.fasterxml.jackson.datatype.jdk8.Jdk8Module" />
</bean>
If you are using latest version of Spring-boot then you could achieve this by adding the following dependency in the pom file
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jdk8</artifactId>
</dependency>
Spring blog says :
Some well known Jackson modules are automatically registered if they are detected on the classpath:
jackson-datatype-jdk7: Java 7 types like java.nio.file.Path (as of 4.2.1 release)
jackson-datatype-joda: Joda-Time types
jackson-datatype-jsr310: Java 8 Date & Time API data types
jackson-datatype-jdk8: other Java 8 types like Optional (as of 4.2.0 release)
And if you want to use the mapper in your code, auto wire the JacksonObjectMapper.
#Autowired
private ObjectMapper jacksonObjectMapper;
Then use the above Spring container's mapper instance to convert Object to String
jacksonObjectMapper.writeValueAsString(user);
The answer above works for Spring 4.
Just make sure you're using the latest xsd's in your xml configuration.
In my situation it was somehow referencing 'spring-mvc-3.0.xsd' and this version does not know the 'mvc:message-converters' tag yet. Changing it to 'spring-mvc.xsd' solved this issue.
How do I properly configure flyway when integrating with Spring? I see there is a configure method that takes properties, but from the spring XML it would take a setter method to provide a way to inject a Properties instance.
I could write my own Pojo to delegate the configuration to the flyway instance, but it somehow feels like I have missed something.
Here is my configuration:
<bean
id="flyway"
class="com.googlecode.flyway.core.Flyway"
init-method="migrate"
lazy-init="false"
depends-on="dataSource"
>
<property name="dataSource" ref="dataSource" />
<property name="locations" value="classpath:/META-INF/migrations" />
</bean>
I would like to provide a dedicated property file for the migration configuration as documented here:
https://github.com/flyway/flyway/blob/master/flyway-commandline/src/main/assembly/flyway.properties
From the javadoc I see that I can set most of the properties. I could work with spring ${} property replacements and loading the property file with the built in mechs, but this would make those properties available to all beans, and I would add each one I need.
My wrapper would provide a setter so I could add the following to my spring xml config:
<property name="configLocations" value="classpath:/META-INF/flyway.properties" />
Any thoughts appreciated.
Spring's MethodInvokingFactoryBean should do what you want.
Alternatively, you can create a migration based on JdbcTemplate using Flyway's SpringJdbcMigration. The following example is copied from the Flyway documentation:
import com.googlecode.flyway.core.api.migration.spring.SpringJdbcMigration;
import org.springframework.jdbc.core.JdbcTemplate;
public class V1_2__Another_user implements SpringJdbcMigration {
#Override
public void migrate(JdbcTemplate jdbcTemplate) throws Exception {
jdbcTemplate.execute("INSERT INTO test_user (name) VALUES ('Obelix')");
}
}
You should use spring annotation and wrap Flyway class, and do whatever you want. For instance, configuring flyway properties. This blog post may give you an example how to do http://esofthead.com/migrate-database-highly-change-environment-multiple-versions-management/