Keycloak-admin-client and fat jar

1

Hi!

I’m building a fat jar using keycloak-admin-client 13.0.1 (Java).

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>3.1.1</version>

                <configuration>
                    <finalName>${finalName}</finalName>
                    <archive>
                        <manifest>
                            <mainClass>org.jboss.pnc.watchdog.keycloak.Main</mainClass>
                        </manifest>
                    </archive>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                    <appendAssemblyId>false</appendAssemblyId>
                </configuration>

                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

However, when I run my fat jar, it fails with:

javax.ws.rs.ProcessingException: RESTEASY004655: Unable to invoke request: javax.ws.rs.ProcessingException: RESTEASY003215: could not find writer for content-type application/x-www-form-urlencoded type: javax.ws.rs.core.Form$1
	at org.jboss.resteasy.client.jaxrs.engines.ApacheHttpClient4Engine.invoke(ApacheHttpClient4Engine.java:328)
	at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.invoke(ClientInvocation.java:443)
	at org.jboss.resteasy.client.jaxrs.internal.proxy.ClientInvoker.invokeSync(ClientInvoker.java:149)
	at org.jboss.resteasy.client.jaxrs.internal.proxy.ClientInvoker.invoke(ClientInvoker.java:112)
	at org.jboss.resteasy.client.jaxrs.internal.proxy.ClientProxy.invoke(ClientProxy.java:76)
	at com.sun.proxy.$Proxy14.grantToken(Unknown Source)
	at org.keycloak.admin.client.token.TokenManager.grantToken(TokenManager.java:90)
	at org.keycloak.admin.client.token.TokenManager.getAccessToken(TokenManager.java:70)
	at org.keycloak.admin.client.token.TokenManager.getAccessTokenString(TokenManager.java:65)
	at org.keycloak.admin.client.resource.BearerAuthFilter.filter(BearerAuthFilter.java:52)
	at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.filterRequest(ClientInvocation.java:579)
	at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.invoke(ClientInvocation.java:440)
	at org.jboss.resteasy.client.jaxrs.internal.proxy.ClientInvoker.invokeSync(ClientInvoker.java:149)
	at org.jboss.resteasy.client.jaxrs.internal.proxy.ClientInvoker.invoke(ClientInvoker.java:112)
	at org.jboss.resteasy.client.jaxrs.internal.proxy.ClientProxy.invoke(ClientProxy.java:76)
	at com.sun.proxy.$Proxy23.list(Unknown Source)
	at org.jboss.pnc.watchdog.keycloak.internal.KeycloakServer.getUsers(KeycloakServer.java:65)
	at org.jboss.pnc.watchdog.keycloak.Utils.checkUserRoles(Utils.java:37)
	at org.jboss.pnc.watchdog.keycloak.Main.call(Main.java:50)
	at org.jboss.pnc.watchdog.keycloak.Main.call(Main.java:14)
	at picocli.CommandLine.executeUserObject(CommandLine.java:1953)
	at picocli.CommandLine.access$1300(CommandLine.java:145)
	at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2352)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2346)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2311)
	at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2179)
	at picocli.CommandLine.execute(CommandLine.java:2078)
	at org.jboss.pnc.watchdog.keycloak.Main.main(Main.java:62)
Caused by: javax.ws.rs.ProcessingException: RESTEASY003215: could not find writer for content-type application/x-www-form-urlencoded type: javax.ws.rs.core.Form$1
	at org.jboss.resteasy.core.interception.ClientWriterInterceptorContext.throwWriterNotFoundException(ClientWriterInterceptorContext.java:38)
	at org.jboss.resteasy.core.interception.AbstractWriterInterceptorContext.getWriter(AbstractWriterInterceptorContext.java:146)
	at org.jboss.resteasy.core.interception.AbstractWriterInterceptorContext.proceed(AbstractWriterInterceptorContext.java:121)
	at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.writeRequestBody(ClientInvocation.java:399)
	at org.jboss.resteasy.client.jaxrs.engines.ApacheHttpClient4Engine.writeRequestBodyToOutputStream(ApacheHttpClient4Engine.java:678)
	at org.jboss.resteasy.client.jaxrs.engines.ApacheHttpClient4Engine.buildEntity(ApacheHttpClient4Engine.java:639)
	at org.jboss.resteasy.client.jaxrs.engines.ApacheHttpClient4Engine.loadHttpMethod(ApacheHttpClient4Engine.java:517)
	at org.jboss.resteasy.client.jaxrs.engines.ApacheHttpClient4Engine.invoke(ApacheHttpClient4Engine.java:316)
	... 27 more

Is there a wrong setting somewhere causing this? It works when running via Intellij.

Sincerely,
Dustin

2

Found the issue! Writing down my findings here in case it helps a kind soul later on:

  • The maven-assembly-plugin ‘jar-with-dependencies’ doesn’t work that well with merging all the ‘META-INF/services’ files together, which is causing the original issue. I think Resteasy client depends on those files to discover implementations for writers and readers.

  • I switched to Maven shade plugin instead:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-shade-plugin</artifactId>
    <version>3.2.4</version>
    <executions>
        <execution>
            <goals>
                <goal>shade</goal>
            </goals>
            <configuration>
                <finalName>${finalName}</finalName>
                <transformers>
                    <!-- need this to merge the services files properly -->
                    <transformer
                            implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                    <!-- add Main-Class to manifest file -->
                    <transformer
                            implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                        <mainClass>Main</mainClass>
                    </transformer>
                </transformers>
                <!-- add this to prevent some security issues when merging everything together -->
                <filters>
                    <filter>
                        <artifact>*:*</artifact>
                        <excludes>
                            <exclude>META-INF/*.SF</exclude>
                            <exclude>META-INF/*.DSA</exclude>
                            <exclude>META-INF/*.RSA</exclude>
                        </excludes>
                    </filter>
                </filters>
            </configuration>
        </execution>
    </executions>
</plugin>

and that fixed it! Special thanks to Alex Szczuczko for helping me on this one.

  • Dustin
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