I'm facing an issue where I have a maven project with Java POJOs.
import lombok.Builder;
import lombok.Getter;
/**
* User DTO.
*/
#Builder
#Getter
public class UserDto {
private String username;
}
I'm have added this maven dependency to another Spring boot based project.
I'm getting the following exception during the application tests.
org.springframework.core.codec.CodecException: Type definition error:
nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of com.models.UserDto (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
However, whenever I add the spring boot starter parent dependency to the maven project I see no errors and the application works as expected.
Note: Also, the project works by adding a default constructor to the pojo. But my question is why would it work with the Spring boot starter added?
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
Related
Spring-boot listener’s #autowire is not work on recent versions
When using 2.3.1.RELEASE of Spring-boot everything is ok.
#WebListener
public class Listener implements ServletContextListener {
#Autowired private Environment env;
#Override public void contextInitialized(ServletContextEvent sce) { try { if (env == null) // is false
When using 2.6.2 of Spring-boot the env will be null
change pom.xml
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.1.RELEASE</version><!-- ******** 2.3.1.RELEASE - 2.6.2 ********** -->
<relativePath/>
</parent>
sample code is in this link
as an issue I created in the spring-boot project in GitHub, this is due to the changes in Spring Boot 2.4 to allow #WebListeners to register servlets and filters. The change in 2.4 requires the Servlet container to be responsible for creating the listener so Spring-based dependency injection is no longer available.
Generally speaking, #ServletComponentScan is intended for registering third-party components where you can't modify the code. If you're in a position to use #Autowired and the like then you should use #Component. An exception to this is where you need to be able to register servlets and filters from your listener. #WebListener should be used in this case.
result of this issue updated the release notes for 2.4.
My maven springboot app has a dependency on two Retrofit clients whose code I have no control over. Both of these clients have a #Configuration class called ClientConfig. When I try to run my application, I get this error:
ConflictingBeanDefinitionException: Annotation-specified bean name 'clientConfig' for bean class [a.b.c.client.config.ClientConfig] conflicts with existing, non-compatible bean definition of same name and class [a.b.c.config.ClientConfig]
How can I fix this? Is there any way I can override the bean names for these classes? This is my maven configuration:
<dependency>
<groupId>a.b</groupId>
<artifactId>lib1-client</artifactId>
<version>1.0.0</version>
</dependency>
<dependency>
<groupId>a.b</groupId>
<artifactId>lib2-client</artifactId>
<version>1.2.55</version>
</dependency>
Only thing I could think of is to exclude them from component scan:
#SpringBootApplication
#ComponentScan(excludeFilters = {"a.b.lib1-client",...})
Goal: migration from Spring Boot 1.x (webMvc) to version 2 (webFlux) and Spring Cloud Edgware SR2 to FinchleyM8 (awaiting release version).
Problem: Feign -> OpenFeign. OpenFeign under the hood uses RxJava but WebFlux - Reactor3. At the current moment when I using Mono as returned type, I have got an error:
Caused by: org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class reactor.core.publisher.Mono]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of reactor.core.publisher.Mono (no Creators, like default construct, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information
Code example:
#FeignClient(name = "thirdpartyresource", url = "${third.party.resource.url}")
public interface ThirdPartyResource {
#PostMapping(value = "/validate", consumes = APPLICATION_FORM_URLENCODED_VALUE)
Mono<ValidationResultDto> validate(MultiValueMap multiValueMap); // WORKS BAD
// Single<ValidationResultDto> validate(MultiValueMap multiValueMap); WORKS WELL
}
Question:
Do I need to create my own converter Single to Mono or it's some problems of spring-cloud-starter-openfeign and all should work OOTB?
The reactor.core.publisher.Mono belongs to the spring-boot-starter-webflux jar.
Get the latest version of it from the mvn repository.
Then add it to your pom.xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
<version>2.5.3</version>
</dependency>
Also do remove spring-boot-starter-web from your pom.xml, just in case if you have it.
<!--<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>-->
This fixed the issue!
You can use those methods to adapt:
For Single<T> rxJavaSingle
Mono.from(RxReactiveStreams.toPublisher(rxJavaSingle))
For Completable rxJavaCompletable
Mono.from(RxReactiveStreams.toPublisher(rxJavaCompletable))
Does anyone know how to get SpatialRepository #Autowiring in a spring boot app? I have put the additional dependency in my classpath
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j-spatial</artifactId>
<version>0.9</version>
</dependency>
with the following configuration options
#SuppressWarnings("unused")
#Configuration
#EnableAutoConfiguration
#EnableTransactionManagement
#EnableNeo4jRepositories(basePackages = {"com.eanda.prototype", "test.com.eanda.prototype"})
#ComponentScan({"com.erranda.prototype", "org.springframework.data.neo4j"})
I have tried it all but no avail. My domain class is this:
public interface ErrandRepository extends GraphRepository<Errand>, SpatialRepository<Errand> {}
I get the following exception when running a query on the spatial repo
java.lang.IllegalArgumentException: No index provider 'spatial' found. Maybe the intended provider (or one more of its dependencies) aren't on the classpath or it failed to load.
Are you introducing the spatial engine to an existing database?
Have you installed the spatial extension in the plugin directory?
Lorenzo
I am trying to build a web (spring-mvc) application with kie (drools 6) integrated via injection. I have used kie workbench to create a workflow, complied and deployed. I have added reference of this artifact in my project's pom.xml and added the local kie-workbench repository as per this blog post and it's working fine (pulling in the artifact as dependency in my maven/spring project). What I am trying to do is inject the kiesession in one of my service as dependency with following snippet -
#Service
public class TniServiceImpl implements TniService {
#Inject
#KSession("tniSession")
private KieSession tniSession;
...
}
In my root-context.xml, I have added the kie namespace as well along with reference to xsd. I have added org.kie.spring.KModuleBeanFactoryPostProcessor as well as per drools documentation. I am trying to make CDI injection work for KSession scanning and injection (it's already working for my other components in same project, using #Inject). So far I am always getting "No qualifying bean of type [org.kie.api.runtime.KieSession] found for dependency" error. Looks like spring is not able to scan the available kie modules and sessions therein. Need help on following -
Is CDI inject really supported with spring? Do I have to configure kmodules and kession explicitly as mentioned here?
Am I missing something here which should make this scanning and injection work?
My environment is following -
spring 3.2.6-RELEASE (including webmvc and other components)
kie-api-6.0.1.FINAL
kie-spring-6.0.1.FINAL
kie-internal-6.0.1.FINAL
I have already gone through following links but no luck (mostly they are not trying to do what I am) -
Loading Drools/KIE Workbench artifacts directly from the repository
why does loading Drools 6 KIE JAR into code fail?
I'll appreciate if anybody can guide me on what could be the missing piece here or if there's no option but to explicitly define all kmodules/ksessions in spring config file.
I had the same problem and found a solution here: http://drools.46999.n3.nabble.com/Spring-4-0-amp-Drools-6-0-1-Integration-issue-td4028052.html
Basically you will need to inject ApplicationContext instead of kieSession and get xml bean manually.
TniServiceImpl.java
#Service
public class TniServiceImpl implements TniService {
#Inject
ApplicationContext context;
KieSession kieSession;
#PostConstruct
public void postConstruct(){
kieSession = (KieSession) context.getBean("ksession1");
}
...
}
root-context.xml
<kie:kmodule id="kmodule1">
<kie:kbase name="kbase1">
<kie:ksession name="ksession1" />
</kie:kbase>
</kie:kmodule>
<bean id="kiePostProcessor" class="org.kie.spring.KModuleBeanFactoryPostProcessor" />
Hope this helps.
UPDATE:
Another way to achieve this is to keep xml identical and instead of trying to inject KieSession, inject KieBase. Then, with the instance of KieBase, create new KieSessions.
#Service
public class TniServiceImpl implements TniService {
#Autowired
private KieBase kbase;
/* inside some method */
#RequestMapping(method=RequestMethod.GET)
public #ResponseBody Data getData() {
KieSession ksession = kbase.newKieSession();
...
}
}
The above answer doesn't work with spring mvc. I found that this is a bug in the existing drools and they are fixing it in the next version. I am stuck at this point since I am using DROOLS in batch mode but I want it to be used in a REST Service hosted on websphere.
The above solution works perfectly within a batch program.
This is what I have working with the latest Spring MVC (Spring Boot)
#SpringBootApplication
public class DroolDemoApplication {
public static void main(String[] args) {
SpringApplication.run(DroolDemoApplication.class, args);
}
#Bean
public KieContainer kieContainer() {
return KieServices.Factory.get().getKieClasspathContainer();
}
#Bean
public KieSession kieSession() throws IOException {
return kieContainer().newKieSession("DroolDemoSession");
}
}
and below is the kmodule.xml
<kbase name="DroolDemoKbase" packages="rules">
<ksession name="DroolDemoSession" />
</kbase>
finally all you do in your controller is
#Autowired
private KieSession kieSession;
kieSession.fireAllRules();
hope this helps those folks still having issues
I had similar issues with the rules not being triggered, and I solved it by using the 6.2.0.Final version of the kie-ci and kie-spring. I tried versions: 7.7.0, 7.2.0, 6.5.0 and 6.4.0, but none of them worked.
...
<properties>
<kie.version>6.2.0.Final</kie.version>
</properties>
...
<dependencies>
...
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-ci</artifactId>
<version>${kie.version}</version>
</dependency>
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-spring</artifactId>
<version>${kie.version}</version>
</dependency>
...
</dependencies>
What also helped was running mvn dependency:tree and seeing which versions of which artefacts/projects are being used.