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java.lang.NullPointerException: 	at com.sun.enterprise.security.auth.realm.ldap.LDAPRealm.groupSearch(LDAPRealm.java:705)	at com.sun.enterprise.security.auth.realm.ldap.LDAPRealm.findAndBind(LDAPRealm.java:497)	at com.sun.enterprise.security.auth.login.LDAPLoginModule.authenticate(LDAPLoginModule.java:108)	at com.sun.enterprise.security.auth.login.PasswordLoginModule.authenticateUser(PasswordLoginModule.java:117)	at com.sun.appserv.security.AppservPasswordLoginModule.login(AppservPasswordLoginModule.java:148)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at javax.security.auth.login.LoginContext.invoke(LoginContext.java:769)	at javax.security.auth.login.LoginContext.access$000(LoginContext.java:186)	at javax.security.auth.login.LoginContext$4.run(LoginContext.java:683)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680)	at javax.security.auth.login.LoginContext.login(LoginContext.java:579)	at com.sun.enterprise.security.auth.login.LoginContextDriver.doPasswordLogin(LoginContextDriver.java:382)	at com.sun.enterprise.security.auth.login.LoginContextDriver.login(LoginContextDriver.java:240)	at com.sun.enterprise.security.auth.login.LoginContextDriver.login(LoginContextDriver.java:153)	at com.sun.web.security.RealmAdapter.authenticate(RealmAdapter.java:483)	at com.sun.web.security.RealmAdapter.authenticate(RealmAdapter.java:425)	at org.apache.catalina.authenticator.FormAuthenticator.authenticate(FormAuthenticator.java:269)	at org.apache.catalina.authenticator.AuthenticatorBase.processSecurityCheck(AuthenticatorBase.java:909)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:546)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:623)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)	at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:326)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:227)	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:170)	at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:822)	at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:719)	at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1013)	at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)	at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)	at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)	at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)	at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)	at com.sun.grizzly.ContextTask.run(ContextTask.java:71)	at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)	at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)	at java.lang.Thread.run(Thread.java:619)