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Published Jul. 2, 2025

Cannot run program "java" error when executing process to generate document previews

Written By

María Picado

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Issue

  • When uploading or previewing images or documents that have not been previously loaded, the following WARN will be thrown. 
    WARN [liferay/document_library_pdf_processor-1][BaseProcessorMessageListener:40]  Unable to process file version 123713 
com.liferay.petra.process.ProcessException: java.io.IOException:  Cannot run program "java": error=2

Environment

  • Liferay DXP 7.0, 7.1, 7.2

Resolution

  • It occurs when the server tries to execute the separate java process that generates the document previews, it does not find java executable and throws the above exception.
  • There is a solution and a workaround:
    • Solution: In order to avoid this behavior, the PATH variable must be set with the path of the java executable. It's usually located in JAVA_HOME/bin.
    • Workaround: To prevent the document preview process to be executed separately set the portal property dl.file.entry.preview.fork.process.enabled to false.
      Important: This workaround is not recommended in production environment.
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