Too many beans

Situation: I have a Weblogic container, an application, which I would like to deploy with an ant script and an error message saying:

[wlst] Exception in thread "main" java.lang.IllegalStateException: Traceback (innermost last):
[wlst]   File "/local/bmiklos/projects/.../build/container/weblogic12/weblogic_setup_server.py", line 28, in ?
[wlst]   File "/local/bmiklos/container/weblogic/12.1.1.0.4/server/wlserver/common/wlst/weblogic_base.py", line 328, in createDataSource
[wlst] weblogic.descriptor.BeanAlreadyExistsException: Bean already exists: "weblogic.j2ee.descriptor.wl.JDBCPropertyBeanImpl@8218c7([...]/JDBCDriverParams/Properties/Properties[user])"
[wlst]     at weblogic.descriptor.internal.ReferenceManager.registerBean(ReferenceManager.java:232)
[wlst]     at weblogic.j2ee.descriptor.wl.JDBCPropertiesBeanImpl.setProperties(JDBCPropertiesBeanImpl.java:133)
[wlst]     at weblogic.j2ee.descriptor.wl.JDBCPropertiesBeanImpl.addProperty(JDBCPropertiesBeanImpl.java:79)
[wlst]     at weblogic.j2ee.descriptor.wl.JDBCPropertiesBeanImpl.createProperty(JDBCPropertiesBeanImpl.java:152)
[wlst]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[wlst]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[wlst]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[wlst]     at java.lang.reflect.Method.invoke(Method.java:601)
[wlst]     at weblogic.management.jmx.modelmbean.WLSModelMBean.invoke(WLSModelMBean.java:437)
[wlst]     at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
[wlst]     at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:792)
[wlst]     at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase$16.run(WLSMBeanServerInterceptorBase.java:449)
[wlst]     at java.security.AccessController.doPrivileged(Native Method)
[wlst]     at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase.invoke(WLSMBeanServerInterceptorBase.java:447)
[wlst]     at weblogic.management.mbeanservers.internal.JMXContextInterceptor.invoke(JMXContextInterceptor.java:263)
[wlst]     at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase$16.run(WLSMBeanServerInterceptorBase.java:449)
[wlst]     at java.security.AccessController.doPrivileged(Native Method)
[wlst]     at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase.invoke(WLSMBeanServerInterceptorBase.java:447)
[wlst]     at weblogic.management.mbeanservers.edit.internal.RecordingInterceptor.invoke(RecordingInterceptor.java:199)
[wlst]     at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase$16.run(WLSMBeanServerInterceptorBase.java:449)
[wlst]     at java.security.AccessController.doPrivileged(Native Method)
[wlst]     at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase.invoke(WLSMBeanServerInterceptorBase.java:447)
[wlst]     at weblogic.management.mbeanservers.internal.SecurityMBeanMgmtOpsInterceptor.invoke(SecurityMBeanMgmtOpsInterceptor.java:65)
[wlst]     at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase$16.run(WLSMBeanServerInterceptorBase.java:449)
[wlst]     at java.security.AccessController.doPrivileged(Native Method)
[wlst]     at weblogic.management.jmx.mbeanserverTraceback (innermost last):
[wlst]   File "/local/bmiklos/projects/.../build/container/weblogic12/we.WLSMBeanServerInterceptorBase.invoke(WLSMBeanServerInterceptorBase.java:447)
[wlst]     at weblogic.management.mbeanservers.edit.internal.EditLockInterceptor.invoke(EditLockInterceptor.java:112)
[wlst]     at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase$blogic_setup_server.py", line 28, in ?
[wlst]   File "/local/bmiklos/container/weblogic/12.1.1.0.4/server/wlserver/common/wlst/weblogic16.run(WLSMBeanServerInterceptorBase.java:449)
[wlst]     at java.security.AccessController.doPrivileged(Native Method)
[wlst]     at weblogic.manag_base.py", line 328, in createDataSource
[wlst] weblogic.descriptor.BeanAlreadyExistsException: Bean already exists: "weblogic.j2ee.desement.jmx.mbeanserver.WLSMBeanServerInterceptorBase.invoke(WLSMBeanServerInterceptorBase.java:447)
[wlst]     at weblogic.management.mbeancriptor.wl.JDBCPropertyBeanImpl@8218c7([MB-DS]/JDBCDriverParams/Properties/Properties[user])"
[wlst]     at weblogic.descriptor.inteservers.internal.SecurityInterceptor.invoke(SecurityInterceptor.java:444)
[wlst]     at weblogic.management.jmx.mbeanserver.WLSMBeanServerrnal.ReferenceManager.registerBean(ReferenceManager.java:232)
[wlst]     at weblogic.j2ee.descriptor.wl.JDBCPropertiesBeanImpl.setProperti.invoke(WLSMBeanServer.java:323)
[wlst]     at weblogic.management.mbeanservers.internal.JMXConnectorSubjectForwarder$11$1.run(JMXConnectoes(JDBCPropertiesBeanImpl.java:133)
[wlst]     at weblogic.j2ee.descriptor.wl.JDBCPropertiesBeanImpl.addProperty(JDBCPropertiesBeanImpl.jarSubjectForwarder.java:663)
[wlst]     at java.security.AccessController.doPrivileged(Native Method)
[wlst]     at weblogic.management.mbeanservers.va:79)
[wlst]     at weblogic.j2ee.descriptor.wl.JDBCPropertiesBeanImpl.createProperty(JDBCPropertiesBeanImpl.java:152)
[wlst]     at sun.reflect.Nainternal.JMXConnectorSubjectForwarder$11.run(JMXConnectorSubjectForwarder.java:661)
[wlst]     at weblogic.security.acl.internal.AuthentictiveMethodAccessorImpl.invoke0(Native Method)
[wlst]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[wlst] atedSubject.doAs(AuthenticatedSubject.java:363)
[wlst]     at weblogic.management.mbeanservers.internal.JMXConnectorSubjectForwarder.invok    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[wlst]     at java.lang.reflect.Method.invoke(Mee(JMXConnectorSubjectForwarder.java:654)
[wlst]     at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:14thod.java:601)
[wlst]     at weblogic.management.jmx.modelmbean.WLSModelMBean.invoke(WLSModelMBean.java:437)
[wlst]     at com.sun.jmx.interceptor.D86)
[wlst]     at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:96)
[wlst]     at javax.management.remote.rmi.RMICefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
[wlst]     at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmonnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1327)
[wlst]     at java.security.AccessController.doPrivileged(Native MethodxMBeanServer.java:792)
[wlst]     at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase$16.run(WLSMBeanServerInterceptorBas)
[wlst]     at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1426)
[wlst]     at javax.management.remoe.java:449)
[wlst]     at java.security.AccessController.doPrivileged(Native Method)
[wlst]     at weblogic.management.jmx.mbeanserver.WLSMBeanServete.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:847)
[wlst]     at javax.management.remote.rmi.RMIConnectionImpl_WLSkel.invoke(UnknrInterceptorBase.invoke(WLSMBeanServerInterceptorBase.java:447)
[wlst]     at weblogic.management.mbeanservers.internal.JMXContextIntercepown Source)
[wlst]     at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:693)
[wlst]     at weblogic.rmi.internal.BasicServerRef$1.tor.invoke(JMXContextInterceptor.java:263)
[wlst]     at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase$16.run(WLSMBeanrun(BasicServerRef.java:518)
[wlst]     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:363)
[wlst]     at webServerInterceptorBase.java:449)
[wlst]     at java.security.AccessController.doPrivileged(Native Method)
[wlst]     at weblogic.management.jmx.mbeanlogic.security.service.SecurityManager.runAs(SecurityManager.java:146)
[wlst]     at weblogic.rmi.internal.BasicServerRef.handleRequest(Baserver.WLSMBeanServerInterceptorBase.invoke(WLSMBeanServerInterceptorBase.java:447)
[wlst]     at weblogic.management.mbeanservers.edit.insicServerRef.java:514)
[wlst]     at weblogic.rmi.internal.wls.WLSExecuteRequest.run(WLSExecuteRequest.java:118)
[wlst]     at weblogic.work.Executeternal.RecordingInterceptor.invoke(RecordingInterceptor.java:199)
[wlst]     at weblogic.management.jmx.mbeanserver.WLSMBeanServerIntercepThread.execute(ExecuteThread.java:256)
[wlst]     at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)
[wlst]
[wlst] weblogic.descriptor.BeanAlretorBase$16.run(WLSMBeanServerInterceptorBase.java:449)
[wlst]     at java.security.AccessController.doPrivileged(Native Method)
[wlst]     at weblogadyExistsException: weblogic.descriptor.BeanAlreadyExistsException: Bean already exists: "weblogic.j2ee.descriptor.wl.JDBCProperic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase.invoke(WLSMBeanServerInterceptorBase.java:447)
[wlst]     at weblogic.managemetyBeanImpl@8218c7([MB-DS]/JDBCDriverParams/Properties/Properties[user])"
[wlst]
[wlst]     at weblogic.management.scripting.WLSTInterpretent.mbeanservers.internal.SecurityMBeanMgmtOpsInterceptor.invoke(SecurityMBeanMgmtOpsInterceptor.java:65)
[wlst]     at weblogic.managementrInvoker.printError(WLSTInterpreterInvoker.java:146)
[wlst]     at weblogic.management.scripting.WLSTInterpreterInvoker.executePyScript(WL.jmx.mbeanserver.WLSMBeanServerInterceptorBase$16.run(WLSMBeanServerInterceptorBase.java:449)
[wlst]     at java.security.AccessControllerSTInterpreterInvoker.java:111)
[wlst]     at weblogic.management.scripting.WLSTInterpreterInvoker.main(WLSTInterpreterInvoker.java:30)
[wlst] .doPrivileged(Native Method)
[wlst]     at weblogic.management.jmx.mbeanserver.WLSMBeanServerInterceptorBase.invoke(WLSMBeanServerInterceptorBase.java:447)
[wlst]     at weblogic.management.mbeanservers.edit

The problem in my case is that the container gets corrupt somehow, so I need to delete the directory containing it and re-create the whole thing. After that deploying my application works again.