Libraries For Deployments To IBM WebSphere are in folder jenkins/plugins/websphere-deployer/WEB-INF/lib/
com.ibm.ws.admin.client_8.5.0.jar
com.ibm.ws.orb_8.5.0.jar
Button "Test Connection" returns: "Connection Successful!".

When trying to deploy EAR to WAS we got following error:

Error deploying to IBM WebSphere Application Server: org.jenkinsci.plugins.websphere.services.deployment.DeploymentServiceException:
at org.jenkinsci.plugins.websphere.services.deployment.WebSphereDeploymentService.getAppName(WebSphereDeploymentService.java:122)
at org.jenkinsci.plugins.websphere.services.deployment.WebSphereDeploymentService.getAppName(WebSphereDeploymentService.java:98)
at org.jenkinsci.plugins.websphere_deployer.WebSphereDeployerPlugin.getAppName(WebSphereDeployerPlugin.java:268)
at org.jenkinsci.plugins.websphere_deployer.WebSphereDeployerPlugin.createArtifact(WebSphereDeployerPlugin.java:226)
at org.jenkinsci.plugins.websphere_deployer.WebSphereDeployerPlugin.perform(WebSphereDeployerPlugin.java:168)
at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:45)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:770)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:734)
at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.post2(MavenModuleSetBuild.java:1037)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:683)
at hudson.model.Run.execute(Run.java:1784)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:529)
at hudson.model.ResourceController.execute(ResourceController.java:89)
at hudson.model.Executor.run(Executor.java:240)
Caused by: com.ibm.websphere.management.application.client.AppDeploymentException: [Root exception is java.lang.IncompatibleClassChangeError: Implementing class]
at com.ibm.websphere.management.application.AppManagementFactory.handleException(AppManagementFactory.java:672)
at com.ibm.websphere.management.application.AppManagementFactory.readArchive(AppManagementFactory.java:141)
at com.ibm.websphere.management.application.AppManagementFactory.readArchive(AppManagementFactory.java:91)
at com.ibm.websphere.management.application.client.AppDeploymentController.readArchive(AppDeploymentController.java:254)
at org.jenkinsci.plugins.websphere.services.deployment.WebSphereDeploymentService.getAppName(WebSphereDeploymentService.java:108)
... 13 more
Caused by: java.lang.IncompatibleClassChangeError: Implementing class
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at jenkins.util.AntClassLoader.defineClassFromData(AntClassLoader.java:1138)
at hudson.ClassicPluginStrategy$AntClassLoader2.defineClassFromData(ClassicPluginStrategy.java:768)
at jenkins.util.AntClassLoader.getClassFromStream(AntClassLoader.java:1309)
at jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1365)
at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1325)
at jenkins.util.AntClassLoader.loadClass(AntClassLoader.java:1078)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at jenkins.util.AntClassLoader.defineClassFromData(AntClassLoader.java:1138)
at hudson.ClassicPluginStrategy$AntClassLoader2.defineClassFromData(ClassicPluginStrategy.java:768)
at jenkins.util.AntClassLoader.getClassFromStream(AntClassLoader.java:1309)
at jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1365)
at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1325)
at jenkins.util.AntClassLoader.loadClass(AntClassLoader.java:1078)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.eclipse.jst.j2ee.commonarchivecore.internal.impl.WARFileImpl.getWARFileAnnotationsDetector(WARFileImpl.java:2908)
at org.eclipse.jst.j2ee.commonarchivecore.internal.impl.WARFileImpl.containsEJBContent(WARFileImpl.java:1975)
at com.ibm.ws.management.application.client.AppInstallHelper.checkForXmiFiles(AppInstallHelper.java:1372)
at com.ibm.ws.management.application.client.AppInstallHelper.checkForXmiFiles(AppInstallHelper.java:1331)
at com.ibm.ws.management.application.client.AppInstallHelper.checkForEE5Restrictions(AppInstallHelper.java:512)
at com.ibm.ws.management.application.client.AppInstallHelper.checkForEE5Restrictions(AppInstallHelper.java:477)
at com.ibm.ws.management.application.client.AppInstallHelper.getAppDeploymentInfo(AppInstallHelper.java:563)
at com.ibm.websphere.management.application.AppManagementFactory.readArchive(AppManagementFactory.java:129)
... 16 more