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Uploading plugin to Confluence failed due to database error

Adrian Moerchen
Hi,
we have a very strange problem, which only occurs on the production system. Test environment is okay not working too.
It is not possible for administrators to manually upload plugins, an error occurs and the following exception is logged:
2014-09-15 10:43:59,837 WARN [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1] [mchange.v2.resourcepool.BasicResourcePool] run Failed to destroy resource: com.mchange.v2.c3p0.impl.NewPooledConnection@5a29db1c
java.sql.SQLException: Some resources failed to close properly while closing com.mchange.v2.c3p0.impl.NewPooledConnection@5a29db1c
	at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnection.java:571)
	at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnection.java:234)
	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.destroyResource(C3P0PooledConnectionPool.java:470)
	at com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask.run(BasicResourcePool.java:964)
	at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
2014-09-15 10:43:59,838 ERROR [UpmAsynchronousTaskManager:thread-1] [springframework.transaction.support.TransactionTemplate] rollbackOnException Application exception overridden by rollback exception
 -- url: /rest/plugins/1.0/ | userName: xyz | referer: https://url/plugins/servlet/upm
java.lang.RuntimeException: There was a problem evicting or flushing a PluginData object
	at com.atlassian.confluence.plugin.persistence.hibernate.HibernatePluginDataDao.saveOrUpdate(HibernatePluginDataDao.java:80)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	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:307)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at com.sun.proxy.$Proxy10.saveOrUpdate(Unknown Source)
	at com.atlassian.confluence.plugin.DefaultPluginInstaller.installPlugin(DefaultPluginInstaller.java:31)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at com.sun.proxy.$Proxy12.installPlugin(Unknown Source)
	at com.atlassian.plugin.manager.NoOpRevertablePluginInstaller.installPlugin(NoOpRevertablePluginInstaller.java:34)
	at com.atlassian.plugin.manager.DefaultPluginManager.installPlugins(DefaultPluginManager.java:457)
	at com.atlassian.confluence.plugin.EventDispatchingPluginController.installPlugins(EventDispatchingPluginController.java:89)
	at sun.reflect.GeneratedMethodAccessor2967.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:307)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at com.sun.proxy.$Proxy53.installPlugins(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor2967.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.atlassian.plugin.osgi.hostcomponents.impl.DefaultComponentRegistrar$ContextClassLoaderSettingInvocationHandler.invoke(DefaultComponentRegistrar.java:129)
	at com.sun.proxy.$Proxy292.installPlugins(Unknown Source)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	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:307)
	at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:58)
	at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:62)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:56)
	at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:39)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.osgi.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:59)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at com.sun.proxy.$Proxy1366.installPlugins(Unknown Source)
	at com.atlassian.upm.manager.install.PluginArtifactInstallerImpl$1.doInTransaction(PluginArtifactInstallerImpl.java:56)
	at com.atlassian.upm.manager.install.PluginArtifactInstallerImpl$1.doInTransaction(PluginArtifactInstallerImpl.java:51)
	at com.atlassian.sal.core.transaction.HostContextTransactionTemplate$1.doInTransaction(HostContextTransactionTemplate.java:25)
	at com.atlassian.sal.spring.component.SpringHostContextAccessor$1.doInTransaction(SpringHostContextAccessor.java:88)
	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:128)
	at com.atlassian.sal.spring.component.SpringHostContextAccessor.doInTransaction(SpringHostContextAccessor.java:82)
	at sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.atlassian.plugin.osgi.hostcomponents.impl.DefaultComponentRegistrar$ContextClassLoaderSettingInvocationHandler.invoke(DefaultComponentRegistrar.java:129)
	at com.sun.proxy.$Proxy208.doInTransaction(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.atlassian.plugin.osgi.bridge.external.HostComponentFactoryBean$DynamicServiceInvocationHandler.invoke(HostComponentFactoryBean.java:154)
	at com.sun.proxy.$Proxy208.doInTransaction(Unknown Source)
	at com.atlassian.sal.core.transaction.HostContextTransactionTemplate.execute(HostContextTransactionTemplate.java:21)
	at sun.reflect.GeneratedMethodAccessor147.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:307)
	at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:58)
	at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:62)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:56)
	at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:39)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.osgi.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:59)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at com.sun.proxy.$Proxy1272.execute(Unknown Source)
	at com.atlassian.upm.manager.install.PluginArtifactInstallerImpl.installPlugins(PluginArtifactInstallerImpl.java:50)
	at com.atlassian.upm.manager.install.AbstractPluginInstallHandler.installSingleArtifact(AbstractPluginInstallHandler.java:95)
	at com.atlassian.upm.manager.install.JarPluginInstallHandler.installPluginInternal(JarPluginInstallHandler.java:47)
	at com.atlassian.upm.manager.install.AbstractPluginInstallHandler.installPlugin(AbstractPluginInstallHandler.java:50)
	at com.atlassian.upm.manager.PluginInstallationServiceImpl.installPlugin(PluginInstallationServiceImpl.java:86)
	at com.atlassian.upm.manager.PluginInstaller.execute(PluginInstaller.java:141)
	at com.atlassian.upm.manager.PluginInstaller.install(PluginInstaller.java:96)
	at com.atlassian.upm.rest.resources.install.InstallTask.installFromFile(InstallTask.java:127)
	at com.atlassian.upm.rest.resources.install.InstallFromFileTask.executeTask(InstallFromFileTask.java:39)
	at com.atlassian.upm.rest.resources.install.InstallTask.call(InstallTask.java:63)
	at com.atlassian.upm.rest.resources.install.InstallTask.call(InstallTask.java:33)
	at com.atlassian.upm.rest.async.AsynchronousTaskManager$1.call(AsynchronousTaskManager.java:77)
	at com.atlassian.upm.rest.async.AsynchronousTaskManager$1.call(AsynchronousTaskManager.java:72)
	at com.atlassian.sal.core.executor.ThreadLocalDelegateCallable.call(ThreadLocalDelegateCallable.java:42)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:744)
Caused by: net.sf.hibernate.exception.GenericJDBCException: could not insert: [com.atlassian.confluence.plugin.persistence.PluginData#17793030]
	at net.sf.hibernate.exception.ErrorCodeConverter.handledNonSpecificException(ErrorCodeConverter.java:90)
	at net.sf.hibernate.exception.ErrorCodeConverter.convert(ErrorCodeConverter.java:79)
	at net.sf.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
	at net.sf.hibernate.persister.AbstractEntityPersister.convert(AbstractEntityPersister.java:1331)
	at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:472)
	at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:436)
	at net.sf.hibernate.impl.ScheduledInsertion.execute(ScheduledInsertion.java:37)
	at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2464)
	at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2450)
	at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2407)
	at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2276)
	at com.atlassian.confluence.plugin.persistence.hibernate.HibernatePluginDataDao.saveOrUpdate(HibernatePluginDataDao.java:75)
	... 117 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 63 milliseconds ago.  The last packet sent successfully to the server was 65 milliseconds ago.
	at sun.reflect.GeneratedConstructorAccessor589.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
	at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1129)
	at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3988)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2598)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2778)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2825)
	at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2156)
	at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2441)
	at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2366)
	at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2350)
	at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate(NewProxyPreparedStatement.java:105)
	at net.sf.hibernate.impl.NonBatchingBatcher.addToBatch(NonBatchingBatcher.java:22)
	at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:462)
	... 124 more
Caused by: java.net.SocketException: Connection reset
	at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:118)
	at java.net.SocketOutputStream.write(SocketOutputStream.java:159)
	at java.io.BufferedOutputStream.write(BufferedOutputStream.java:122)
	at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3968)
	... 134 more
2014-09-15 10:43:59,839 WARN [UpmAsynchronousTaskManager:thread-1] [atlassian.upm.manager.PluginInstallationServiceImpl] installPlugin Plugin installation failed: Could not roll back Hibernate transaction; nested exception is net.sf.hibernate.TransactionException: Rollback failed with SQL exception: 
 -- url: /rest/plugins/1.0/ | userName: xyz | referer: https://url/plugins/servlet/upm
2014-09-15 10:43:59,839 WARN [UpmAsynchronousTaskManager:thread-1] [atlassian.upm.manager.PluginInstallationServiceImpl] installPlugin org.springframework.transaction.TransactionSystemException: Could not roll back Hibernate transaction; nested exception is net.sf.hibernate.TransactionException: Rollback failed with SQL exception: 
 -- url: /rest/plugins/1.0/ | userName: xyz | referer: https://url/plugins/servlet/upm
org.springframework.transaction.TransactionSystemException: Could not roll back Hibernate transaction; nested exception is net.sf.hibernate.TransactionException: Rollback failed with SQL exception: 
	at org.springframework.orm.hibernate.HibernateTransactionManager.doRollback(HibernateTransactionManager.java:532)
	at org.springframework.transaction.support.AbstractPlatformTransactionManager.processRollback(AbstractPlatformTransactionManager.java:823)
	at org.springframework.transaction.support.AbstractPlatformTransactionManager.rollback(AbstractPlatformTransactionManager.java:800)
	at org.springframework.transaction.support.TransactionTemplate.rollbackOnException(TransactionTemplate.java:154)
	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:132)
	at com.atlassian.sal.spring.component.SpringHostContextAccessor.doInTransaction(SpringHostContextAccessor.java:82)
	at sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.atlassian.plugin.osgi.hostcomponents.impl.DefaultComponentRegistrar$ContextClassLoaderSettingInvocationHandler.invoke(DefaultComponentRegistrar.java:129)
	at com.sun.proxy.$Proxy208.doInTransaction(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.atlassian.plugin.osgi.bridge.external.HostComponentFactoryBean$DynamicServiceInvocationHandler.invoke(HostComponentFactoryBean.java:154)
	at com.sun.proxy.$Proxy208.doInTransaction(Unknown Source)
	at com.atlassian.sal.core.transaction.HostContextTransactionTemplate.execute(HostContextTransactionTemplate.java:21)
	at sun.reflect.GeneratedMethodAccessor147.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:307)
	at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:58)
	at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:62)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:56)
	at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:39)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.osgi.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:59)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at com.sun.proxy.$Proxy1272.execute(Unknown Source)
	at com.atlassian.upm.manager.install.PluginArtifactInstallerImpl.installPlugins(PluginArtifactInstallerImpl.java:50)
	at com.atlassian.upm.manager.install.AbstractPluginInstallHandler.installSingleArtifact(AbstractPluginInstallHandler.java:95)
	at com.atlassian.upm.manager.install.JarPluginInstallHandler.installPluginInternal(JarPluginInstallHandler.java:47)
	at com.atlassian.upm.manager.install.AbstractPluginInstallHandler.installPlugin(AbstractPluginInstallHandler.java:50)
	at com.atlassian.upm.manager.PluginInstallationServiceImpl.installPlugin(PluginInstallationServiceImpl.java:86)
	at com.atlassian.upm.manager.PluginInstaller.execute(PluginInstaller.java:141)
	at com.atlassian.upm.manager.PluginInstaller.install(PluginInstaller.java:96)
	at com.atlassian.upm.rest.resources.install.InstallTask.installFromFile(InstallTask.java:127)
	at com.atlassian.upm.rest.resources.install.InstallFromFileTask.executeTask(InstallFromFileTask.java:39)
	at com.atlassian.upm.rest.resources.install.InstallTask.call(InstallTask.java:63)
	at com.atlassian.upm.rest.resources.install.InstallTask.call(InstallTask.java:33)
	at com.atlassian.upm.rest.async.AsynchronousTaskManager$1.call(AsynchronousTaskManager.java:77)
	at com.atlassian.upm.rest.async.AsynchronousTaskManager$1.call(AsynchronousTaskManager.java:72)
	at com.atlassian.sal.core.executor.ThreadLocalDelegateCallable.call(ThreadLocalDelegateCallable.java:42)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:744)
Caused by: net.sf.hibernate.TransactionException: Rollback failed with SQL exception: 
	at net.sf.hibernate.transaction.JDBCTransaction.rollback(JDBCTransaction.java:91)
	at org.springframework.orm.hibernate.HibernateTransactionManager.doRollback(HibernateTransactionManager.java:529)
	... 54 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Communications link failure during rollback(). Transaction resolution unknown.
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
	at com.mysql.jdbc.Util.getInstance(Util.java:386)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1015)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920)
	at com.mysql.jdbc.ConnectionImpl.rollback(ConnectionImpl.java:5084)
	at com.mchange.v2.c3p0.impl.NewProxyConnection.rollback(NewProxyConnection.java:855)
	at net.sf.hibernate.transaction.JDBCTransaction.rollback(JDBCTransaction.java:86)
	... 55 more
Some information:
Confluence is 5.4
Normal usage is working fine
The system is not allowed to access the internet and though not the marketplace
Any ideas?
Thanks, Adrian
Accepted answers

Adrian Moerchen
Okay, the solution was quite easy: Just use the correct (supported) MySQL server version!!!!!!
All comments

Jobin Kuruvilla [Adaptavist]
There is a JIRA KB for the same error. Maybe try the same?
https://confluence.atlassian.com/display/JIRAKB/Reindexing+JIRA+Results+in+Communications+Link+Failure+During+Commit
If that doesn't work, try this: https://confluence.atlassian.com/display/CONFKB/%27Communications+link+failure%27+CommunicationsException+Error+with+JIRA+User+Management+on+MySQL
Tiago Comasseto
Hi Adrian, it's a bit difficult to determine the cause of this issue, but it looks like something related to database communication because of the message "<em>Communications link failure</em>".
Here some of the things that you may to check:
Update Universal Plugin Manager to the latest compatible version;
Check your database server settings, specially max_allowed_packet and transaction-isolation (it must be READ-COMMITTED)
Configure a validation query SQL, so that the application will validate if the connection pool isn't broken.
I hope it helps.
Cheers
Adrian Moerchen
Thank You, we will try this.
Adrian Moerchen
Thanks, for your answer. I checked the database settings and validation query, but these are set. To update UPM, I would need a manual way to do this, as upload isn't working.
Adrian Moerchen
Thanks again, but unfortunately this didn't worked.
Adrian Moerchen
Okay, the solution was quite easy: Just use the correct (supported) MySQL server version!!!!!!
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