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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 http://www.openoffice.org/issues/ by gilh, 1 year ago
via Stack Overflow by Gyowanny Pessatto Queiroz
, 2 years ago
This exception has no message.
via liferay.com 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(Hashtable.java:514)	at java.util.Properties.setProperty(Properties.java:161)	at com.atlassian.crowd.dao.directory.DirectoryPropertiesMapper.exportProperties(DirectoryPropertiesMapper.java:222)	at com.atlassian.crowd.file.FileConfigurationExporter.exportDirectories(FileConfigurationExporter.java:29)	at com.atlassian.crowd.manager.backup.DefaultBackupManager.backup(DefaultBackupManager.java:74)	at sun.reflect.GeneratedMethodAccessor545.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)	at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)	at com.sun.proxy.$Proxy60.backup(Unknown Source)	at com.atlassian.crowd.manager.backup.BackupJobRunner.runJob(BackupJobRunner.java:37)	at com.atlassian.scheduler.core.JobLauncher.runJob(JobLauncher.java:135)	at com.atlassian.scheduler.core.JobLauncher.launchAndBuildResponse(JobLauncher.java:101)	at com.atlassian.scheduler.core.JobLauncher.launch(JobLauncher.java:80)	at com.atlassian.scheduler.quartz1.Quartz1Job.execute(Quartz1Job.java:32)	at org.quartz.core.JobRunShell.run(JobRunShell.java:223)