RestClientBuilder and jUnit >> No RestClientBuilderResolver implementation found!

[Ralph Soika]

Hi,

how to test a MicroProfile Rest Client with jUnit? I can't find an example. 

I build my test code like this:

 URL apiUrl = new URL(base_uri);
 MyService docService =
     RestClientBuilder.newBuilder()
                      .baseUrl(apiUrl)
                      .build(MytService.class);

but I got the following exception in junit testing:

java.lang.IllegalStateException: No RestClientBuilderResolver implementation found!
 at org.eclipse.microprofile.rest.client.spi.RestClientBuilderResolver.instance(RestClientBuilderResolver.java:84)
 at org.eclipse.microprofile.rest.client.RestClientBuilder.newBuilder(RestClientBuilder.java:41)
 at org.imixs.workflow.rest.WorkflowClientMicroprofile.getDocumentCustom(WorkflowClientMicroprofile.java:81)
 at org.imixs.workflow.rest.TestReportServiceMicroprofile.testGetDocument(TestReportServiceMicroprofile.java:36)
 .....

My maven dependenciesl looks like this: 

 <dependencies>


 <!-- JEE Dependencies -->
 <dependency>
 <groupId>javax</groupId>
 <artifactId>javaee-api</artifactId>
 <version>8.0</version>
 <scope>provided</scope>
 </dependency>

.....

 <!-- microprofile-rest-client-api -->
 <dependency>
 <groupId>org.eclipse.microprofile.rest.client</groupId>
 <artifactId>microprofile-rest-client-api</artifactId>
 <version>1.0.1</version>
 </dependency>

 <!-- JUnit Tests -->
 <dependency>
 <groupId>junit</groupId>
 <artifactId>junit</artifactId>
 <version>4.8.1</version>
 <scope>test</scope>
 </dependency>

 <!-- JAX-RS 2.0 Test dependencies -->
 <dependency>
 <groupId>org.glassfish.jersey.core</groupId>
 <artifactId>jersey-client</artifactId>
 <version>2.27</version>
 <scope>test</scope>
 </dependency>

 <dependency>
 <groupId>org.apache.cxf</groupId>
 <artifactId>cxf-rt-rs-client</artifactId>
 <version>3.0.15</version>
 <scope>test</scope>
 </dependency>


 </dependencies>

Can anybody give me a short example?

===
Ralph

[Emily Jiang]

To make it running as a junit, you need to provide an implementation of RestClientBuilderResolver, which is a kind of bootstrap.

Emily

[Andy McCright]

Emily is right.  You have the CXF RS Client in the pom.xml, but you will also need the cxf.rt.rs.mp.client artifact - this module contains CXF's MP Rest Client implementation - and it depends on rt-rs-client module that you already import.

If it helps, you can view the pom.xml file that we use with OpenLiberty for running the MP Rest Client TCK at:

https://github.com/OpenLiberty/open-liberty/blob/integration/dev/com.ibm.ws.microprofile.rest.client_fat_tck/publish/tckRunner/tck/pom.xml

(Notice that we use system scope to use the CXF libraries that we re-package in Liberty - unless you are also using Liberty, you will want to change the scope)

Hope this helps,

Andy