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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

Solutions on the web

via Atlassian JIRA by Pietro Schaff [Atlassian], 1 year ago
via Atlassian JIRA by Pietro Schaff [Atlassian], 1 year ago
via by gilh, 1 year ago
via Stack Overflow by Gyowanny Pessatto Queiroz
, 2 years ago
This exception has no message.
via by Unknown author, 2 years ago
via GitHub by noderblade
, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at java.util.Hashtable.put(	at java.util.Properties.setProperty(	at	at com.atlassian.crowd.file.FileConfigurationExporter.exportDirectories(	at com.atlassian.crowd.manager.backup.DefaultBackupManager.backup(	at sun.reflect.GeneratedMethodAccessor545.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(	at java.lang.reflect.Method.invoke(	at	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(	at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(	at com.sun.proxy.$Proxy60.backup(Unknown Source)	at com.atlassian.crowd.manager.backup.BackupJobRunner.runJob(	at com.atlassian.scheduler.core.JobLauncher.runJob(	at com.atlassian.scheduler.core.JobLauncher.launchAndBuildResponse(	at com.atlassian.scheduler.core.JobLauncher.launch(	at com.atlassian.scheduler.quartz1.Quartz1Job.execute(	at