weblogic.webservice.dd.DDProcessingException: There must be at least one <operation> el ement in <operations> (Line 12, Column 8) [servicegen]

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Session bean as service 2

There must be at least one <operation> el ement in <operations> (Line 12, Column 8) [servicegen]

How does servicegen choose EJBs to generate webservices?

There must be at least one <operation> element in <operations> (Line 14, Column 8)

weblogic.webservice.dd.DDProcessingException: There must be at least
one <operation> el
ement in <operations> (Line 12, Column 8)
[servicegen]	at weblogic.webservice.dd.DDLoader.processOperationElements(DDLoader.java:855)	at weblogic.webservice.dd.DDLoader.processOperationsElement(DDLoader.java:841)	at weblogic.webservice.dd.DDLoader.processWebServiceElement(DDLoader.java:378)	at weblogic.webservice.dd.DDLoader.processWebServiceElements(DDLoader.java:283)	at weblogic.webservice.dd.DDLoader.processWebServicesElement(DDLoader.java:271)	at weblogic.webservice.dd.DDLoader.load(DDLoader.java:249)	at weblogic.webservice.util.WebServiceWarFile.getWSDD(WebServiceWarFile.java:79)	at weblogic.ant.taskdefs.webservices.clientgen.EARClientGen.getWebServiceDD(EARClientGen.java:330)	at weblogic.ant.taskdefs.webservices.clientgen.EARClientGen.run(EARClientGen.java:110)	at weblogic.ant.taskdefs.webservices.clientgen.ClientGenTask.execute(ClientGenTask.java:270)	at weblogic.ant.taskdefs.webservices.servicegen.ServiceGenTask.generateClient(ServiceGenTask.java:290)	at weblogic.ant.taskdefs.webservices.servicegen.ServiceGenTask.execute(ServiceGenTask.java:159)	at org.apache.tools.ant.Task.perform(Task.java:217)	at org.apache.tools.ant.Target.execute(Target.java:164)	at org.apache.tools.ant.Target.performTasks(Target.java:182)	at org.apache.tools.ant.Project.executeTarget(Project.java:601)	at org.apache.tools.ant.Project.executeTargets(Project.java:560)	at org.apache.tools.ant.Main.runBuild(Main.java:454)	at org.apache.tools.ant.Main.start(Main.java:153)	at org.apache.tools.ant.Main.main(Main.java:176)