Synchrony Fails to Start due to a NullPointerException
Platform notice: Server and Data Center only. This article only applies to Atlassian products on the Server and Data Center platforms.
Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Problem
When starting Confluence, Synchrony fails to start due to a NullPointerException, thus the Collaborative Editing feature does not work.
The following appears in the atlassian-confluence.log
2016-12-12 12:02:23,680 INFO [synchrony-interop-executor:thread-1] [plugins.synchrony.utils.TomcatConfigHelper] getProxyPort Checking if Tomcat is running behind a reverse proxy in /opt/atlassian/confluence/conf/server.xml...
2016-12-12 12:02:23,700 INFO [synchrony-interop-executor:thread-1] [plugins.synchrony.bootstrap.DefaultSynchronyProcessManager] isSynchronyProxyEnabled proxy port present: true
2016-12-12 12:02:23,819 INFO [Long running task: EnableTask] [plugins.synchrony.tasks.AbstractConfigLongRunningTask] execute Removed 0 stale shared drafts.
2016-12-12 12:02:23,820 ERROR [Long running task: EnableTask] [plugins.synchrony.tasks.AbstractConfigLongRunningTask] runInternal An error occurred when running a Synchrony ConfigLongRunningTask
-- url: /rest/synchrony-interop/enable | referer: https://baseurl/admin/confluence-collaborative-editor-plugin/configure.action | traceId: 94da089dbd790dfc | userName: admin
java.lang.NullPointerException
at java.util.Hashtable.put(Hashtable.java:459)
at java.util.Properties.setProperty(Properties.java:166)
at com.atlassian.confluence.plugins.synchrony.bootstrap.DefaultSynchronyProcessManager.setupEnvironment(DefaultSynchronyProcessManager.java:297)
at com.atlassian.confluence.plugins.synchrony.bootstrap.DefaultSynchronyProcessManager.trySetup(DefaultSynchronyProcessManager.java:502)
at com.atlassian.confluence.plugins.synchrony.bootstrap.DefaultSynchronyProcessManager.lambda$startProcess$1(DefaultSynchronyProcessManager.java:420)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)Diagnosis
Diagnostic Steps
- The database user and password are specified in the connection url, so the following properties are not present in the confluence.cfg.xml file:
<property name="hibernate.connection.password">YOUR_DATABASE_PASS</property> <property name="hibernate.connection.username">YOUR_DATABASE_USER</property>
Cause
The problem is on this part of the code: DefaultSynchronyProcessManager.java:297
DefaultSynchronyProcessManager.java
env.setProperty(SynchronyEnv.JdbcUrl.getEnvName(), connectionUrl);
env.setProperty(SynchronyEnv.JdbcUser.getEnvName(), credentials.getLeft());
env.setProperty(SynchronyEnv.JdbcPassword.getEnvName(), credentials.getRight());
env.setProperty(SynchronyEnv.JwtPublicKey.getEnvName(), (String) config.getProperty(JWT_PUBLIC_KEY));
env.setProperty(SynchronyEnv.JwtPrivateKey.getEnvName(), (String) config.getProperty(JWT_PRIVATE_KEY));
String internalBaseUrl = computeInternalBaseUrl();
if (!serviceUrl.equalsIgnoreCase(internalBaseUrl)) {
serviceUrl = Joiner.on(",").join(serviceUrl, internalBaseUrl);
}
env.setProperty(SynchronyEnv.ServiceUrl.getEnvName(), serviceUrl);
return ImmutableMap.<String, String>builder()
.putAll((Map) env)
.build();- On line 297, Synchrony is trying to retrieve the database user, which was not specified in the confluence.cfg.xml file, so the NPE occurs.
Resolution
To fix this problem, make sure to specify both the database username and password in the confluence.cfg.xml file, located under the <confluence-home> directory. These lines should be added there:
<property name="hibernate.connection.password">YOUR_DATABASE_PASS</property>
<property name="hibernate.connection.username">YOUR_DATABASE_USER</property>
Last modified on Dec 14, 2016
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