Issue Summary

Confluence Health Check is not loading and it just gives a blank screen with the message “The contents of this tab are loading...”  also when Confluence has a Data Source connection with below tomcat settings in datasource:

factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
jdbcInterceptors="nl.nlighten.prometheus.tomcat.TomcatJdbcInterceptor(logFailed=true,logSlow=true,threshold=1000,buckets=.01|.05|.1|1|10,slowQueryBuckets=1|10|30)"

On further investigation found below error in logs:

2021-11-01 18:39:26,445 INFO [Catalina-utility-2] [com.atlassian.confluence.lifecycle] init Confluence is ready to serve
2021-11-01 18:40:18,477 ERROR [http-nio-27130-exec-4] [ContainerBase.[Standalone].[localhost].[/c7130]] log Unhandled exception occurred whilst decorating page
 -- referer: http://localhost:27130/c7130/plugins/servlet/troubleshooting/view/ | url: /c7130/plugins/servlet/troubleshooting/view/atst-detect-issues/view | traceId: 10a70e6989106ce4 | userName: admin
java.lang.NullPointerException: null value in entry: driver=null
	at com.google.common.collect.CollectPreconditions.checkEntryNotNull(CollectPreconditions.java:32)
	at com.google.common.collect.ImmutableMap.entryOf(ImmutableMap.java:176)
	at com.google.common.collect.ImmutableMap$Builder.put(ImmutableMap.java:285)
	at com.atlassian.confluence.plugins.synchrony.bootstrap.DefaultSynchronyProcessManager.getConfiguration(DefaultSynchronyProcessManager.java:162)

Everything works properly till Atlassian Troubleshooting and Support Tools 1.32.7 version but when the ATST plugin is upgraded to any new version, the Health check started failing with a blank screen. Also, when removing the below settings from the data source connection everything works with the latest version of the Atlassian Troubleshooting and Support Tools plugin.

 factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" jdbcInterceptors="nl.nlighten.prometheus.tomcat.TomcatJdbcInterceptor(logFailed=true,logSlow=true,threshold=1000,buckets=.01|.05|.1|1|10,slowQueryBuckets=1|10|30)"

Steps to Reproduce

1. Configure Confluence Data source and use the below settings in the Datasource connections:

    factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" jdbcInterceptors="nl.nlighten.prometheus.tomcat.TomcatJdbcInterceptor(logFailed=true,logSlow=true,threshold=1000,buckets=.01|.05|.1|1|10,slowQueryBuckets=1|10|30)"

2.  So Datasource connection should be like below:

   <Resource name="jdbc/confluence" auth="Container" type="javax.sql.DataSource"
                                   factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
                                   jdbcInterceptors="nl.nlighten.prometheus.tomcat.TomcatJdbcInterceptor(logFailed=true,logSlow=true,threshold=1000,buckets=.01|.05|.1|1|10,slowQueryBuckets=1|10|30)"
            			username="Sanitized by Support Utility"
            			password="Sanitized by Support Utility"
            			driverClassName="com.mysql.jdbc.Driver"
            			url="jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=utf8"
            			maxTotal="60"
            			maxIdle="20"
            			defaultTransactionIsolation="READ_COMMITTED"
            			validationQuery="Select 1" /
   

3. When you will open the health check it will not load and it will give you the below error in the logs:

   2021-11-01 18:39:26,445 INFO [Catalina-utility-2] [com.atlassian.confluence.lifecycle] init Confluence is ready to serve
   2021-11-01 18:40:18,477 ERROR [http-nio-27130-exec-4] [ContainerBase.[Standalone].[localhost].[/c7130]] log Unhandled exception occurred whilst decorating page
    -- referer: http://localhost:27130/c7130/plugins/servlet/troubleshooting/view/ | url: /c7130/plugins/servlet/troubleshooting/view/atst-detect-issues/view | traceId: 10a70e6989106ce4 | userName: admin
   java.lang.NullPointerException: null value in entry: driver=null
   	at com.google.common.collect.CollectPreconditions.checkEntryNotNull(CollectPreconditions.java:32)
   	at com.google.common.collect.ImmutableMap.entryOf(ImmutableMap.java:176)
   	at com.google.common.collect.ImmutableMap$Builder.put(ImmutableMap.java:285)
   	at com.atlassian.confluence.plugins.synchrony.bootstrap.DefaultSynchronyProcessManager.getConfiguration(DefaultSynchronyProcessManager.java:162)
   

Expected Results

The health check should load with every tomcat settings with the latest ATST plugin.

Actual Results

Health check loads a blank page with the latest version of ATST plugin .

The below exception is thrown in the xxxxxxx.log file:

2021-11-01 18:39:26,445 INFO [Catalina-utility-2] [com.atlassian.confluence.lifecycle] init Confluence is ready to serve
2021-11-01 18:40:18,477 ERROR [http-nio-27130-exec-4] [ContainerBase.[Standalone].[localhost].[/c7130]] log Unhandled exception occurred whilst decorating page
 -- referer: http://localhost:27130/c7130/plugins/servlet/troubleshooting/view/ | url: /c7130/plugins/servlet/troubleshooting/view/atst-detect-issues/view | traceId: 10a70e6989106ce4 | userName: admin
java.lang.NullPointerException: null value in entry: driver=null
	at com.google.common.collect.CollectPreconditions.checkEntryNotNull(CollectPreconditions.java:32)
	at com.google.common.collect.ImmutableMap.entryOf(ImmutableMap.java:176)
	at com.google.common.collect.ImmutableMap$Builder.put(ImmutableMap.java:285)
	at com.atlassian.confluence.plugins.synchrony.bootstrap.DefaultSynchronyProcessManager.getConfiguration(DefaultSynchronyProcessManager.java:162)

Workaround

There is 2 workaround,

1. Migrate the Datasource to Hibernate connections.
2. Or remove the below Tomcat settings from the Datasource:

    factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
                                   jdbcInterceptors="nl.nlighten.prometheus.tomcat.TomcatJdbcInterceptor(logFailed=true,logSlow=true,threshold=1000,buckets=.01|.05|.1|1|10,slowQueryBuckets=1|10|30)"