Getting SandboxException errors when initiating the Sandbox process due to not finding a valid executable Java
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Summary
When exporting a page to PDF or a file is converted, a external process pool called Sandbox is triggered. If there is a Java change/modification in the Java path, Confluence might not find the right Java executable to initiate the new Sandbox process.
Environment
Confluence 8.X
Diagnosis
In the atlassian-confluence.log files you will find a SandboxException message as the one below:
Caused by: com.atlassian.confluence.util.sandbox.SandboxException: /usr/lib/jvm/java-11-openjdk-11.0.21.0.9-1.el7_9.x86_64/bin/java is not an executable
at com.atlassian.confluence.impl.util.sandbox.SandboxProcess.getJavaRuntime(SandboxProcess.java:330)
at com.atlassian.confluence.impl.util.sandbox.SandboxProcess.start(SandboxProcess.java:254)
at com.atlassian.confluence.impl.util.sandbox.SandboxProcess.startIfDead(SandboxProcess.java:242)
at com.atlassian.confluence.impl.util.sandbox.SandboxProcess.execute(SandboxProcess.java:120)
at com.atlassian.confluence.impl.util.sandbox.SandboxLocalProcessPool.execute(SandboxLocalProcessPool.java:107)
at com.atlassian.confluence.impl.util.sandbox.ConfluenceSandboxPoolFactory$LazySandbox.execute(ConfluenceSandboxPoolFactory.java:70)
at com.atlassian.confluence.impl.util.sandbox.DefaultSandbox.execute(DefaultSandbox.java:36)
at com.atlassian.confluence.extra.flyingpdf.sandbox.PdfExportSandbox.execute(PdfExportSandbox.java:49)
at com.atlassian.confluence.extra.flyingpdf.sandbox.SandboxXmlToPdfConverter.convertXhtmlToPdf(SandboxXmlToPdfConverter.java:83)
... 488 moreYour OS administrator can confirm that there is no executable in the location mentioned in the Confluence error message:
$ /usr/lib/jvm/java-11-openjdk-11.0.21.0.9-1.el7_9.x86_64/bin/java -version
-bash: /usr/lib/jvm/java-11-openjdk-11.0.21.0.9-1.el7_9.x86_64/bin/java: No such file or directoryCause
The cause of this error is that there was a Java-Update on the machine without re-starting Confluence.
Solution
Restarting Confluence will help to set the proper path.
Otherwise, follow the steps in our document Change the Java vendor or version Confluence uses to modify the new path manually.