NoClassDefFoundError: ca/uhn/fhir/context/FhirContext

[Carty Castaldi]

Team,

I am making progress with the skeleton client,  I commit here to help future java/maven newbies, there is so much cool stuff here.

I am running on a Debian machine at GCP, no IDE just java and maven.
$ java --version
openjdk 11.0.13 2021-10-19

$ mvn -v

Apache Maven 3.6.0

Maven build runs OK, I execute the TestApplication class:

$ java -cp target/hapi-fhirstarters-client-skeleton-5.0.0.jar test.TestApplication

and at the first call out:
 
FhirContext ctx = FhirContext.forR4();

I get the exception:

Exception in thread "main" java.lang.NoClassDefFoundError: ca/uhn/fhir/context/FhirContext at test.TestApplication.main(TestApplication.java:19)Caused by: java.lang.ClassNotFoundException: ca.uhn.fhir.context.FhirContext at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522) ... 1 more

I have learned a ton about maven and java configs in the last days but am stuck, I very much appreciate any help.

-Carty

[Carty Castaldi]

More info I did a maven dependency check:

[WARNING] Used undeclared dependencies found:[WARNING] ca.uhn.hapi.fhir:org.hl7.fhir.r4:jar:5.5.7:compile[WARNING] Unused declared dependencies found:[WARNING] ca.uhn.hapi.fhir:hapi-fhir-client:jar:5.6.0:compile[WARNING] ca.uhn.hapi.fhir:hapi-fhir-structures-r4:jar:5.6.0:compile[WARNING] ch.qos.logback:logback-classic:jar:1.2.3:compile

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[Carty Castaldi]

Update in case anyone has a similar problem, I installed Eclipse on my mac and there the client skeleton builds and executes fine.

The issue will continue to bug me but I can now compare the two configs, I'd like to be able to run on a headless unix VM, will post here as I learn more.

[Carty Castaldi]

OK I installed Eclipse on my (headless) Debian VM with remote desktop and the Client Skeleton compiles and runs fine, my issue is apparently related to running outside Eclipse.

[AfternoonLemon]

Just in case anyone else encountered this problem, and were using Maven to compile: it does not include dependencies in the output jar file by default.

Adding this plugin to pom.xml solved it for me:

<plugin>
<!-- NOTE: We don't need a groupId specification because the group is
org.apache.maven.plugins ...which is assumed by default.
-->
<artifactId>maven-assembly-plugin</artifactId>
<version>3.7.1</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id> <!-- this is used for inheritance merges -->
<phase>package</phase> <!-- bind to the packaging phase -->
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>