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  1. Is OpenJDK supported by Confluence?

    means that our Support team uses AdoptOpenJDK to replicate issues that a customer using OpenJDK Java has raised. If a customer uses a different distribution of OpenJDK (e.g. Zulu https://www.azul.com/downloads/zulu-community/) we’ll
    Confluence Knowledge BaseApr 08, 2025
  2. Getting "Cannot open <nil> as a Reader" in Synchrony logs when editing a page

    :44,603 DEBUG [253:StdOutHandler [/opt/java/openjdk/bin/java]] 2023-10-26 06:50:44,603 ERROR [async-dispatch-16 … :44,603 DEBUG [253:StdOutHandler [/opt/java/openjdk/bin/java]] :cause "Cannot open <nil> as a Reader." 2023-10-26
    Confluence Knowledge BaseApr 11, 2025
  3. Confluence Shows Unreadable CAPTCHA

    or  a non-standard JDK is used such as OpenJDK. Resolution Download the standard and supported Oracle JDK … the standard JDK.                            Severity : Medium Regular Expression: captcha | openjdk
    Confluence Knowledge BaseApr 10, 2025
  4. Outdated JDK in Confluence Data Center

    /provider used:  For Eclipse Temurin OpenJDK released by Adoptium, please see the OpenJDK Archives Download Page. Atlassian uses Temurin distribution to replicate issues raised with OpenJDK. If you’re using a different
    Confluence Knowledge BaseApr 03, 2025
  5. Getting SandboxException errors when initiating the Sandbox process due to not finding a valid executable Java

    /lib/jvm/java-11-openjdk-11.0.21.0.9-1.el7_9.x86_64/bin/java is not an executable … /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
    Confluence Knowledge BaseApr 11, 2025
  6. Unable to insert any macros through the macro browser due to JAVA errors

    ) at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1937) Causes Confluence is running on OpenJDK which … Resolution 1 Install a supported JDK. OpenJDK is not supported by Confluence.  A number of problems can occur when using
    Confluence Knowledge BaseApr 08, 2025
  7. Synchrony is killed with SIGSEGV (0xb) - G1ParScanThreadState::copy_to_survivor_space

    /jvm/jdk-11.0.23+9/bin/java]] # JRE version: OpenJDK Runtime Environment Temurin-11.0.23+9 (11.0.23+9) (build 11.0.23+9) 2024-10-24 20:21:11,659 DEBUG [111:StdOutHandler [/lib/jvm/jdk-11.0.23+9/bin/java]] # Java VM: OpenJDK 64-Bit
    Confluence Knowledge BaseApr 11, 2025
  8. Confluence JVM crashes with SIGSEGV in libjvm.so because of the C2 Compiler attempting to optimize com.aspose.slides methods used for file preview.

    Environment: # # SIGSEGV (0xb) at pc=0x00007fe6b0b08252, pid=2019060, tid=2019072 # # JRE version: OpenJDK Runtime Environment Temurin-11.0.20.1+1 (11.0.20.1+1) (build 11.0.20.1+1) # Java VM: OpenJDK 64-Bit Server VM Temurin-11.0.20.1+1
    Confluence Knowledge BaseApr 08, 2025
  9. Chart Macro Fails to Render due to Problem in Class Initialisation

    JDK. OpenJDK is known to cause this problem. See our Supported Platforms. Regular
    Confluence Knowledge BaseApr 09, 2025
  10. Confluence does not start due to "Cannot allocate memory or error=12, Not enough space"

    memory. Diagnosis A similar error might be seen in Tomcat logs (catalina.out). OpenJDK 64-Bit Server VM warning
    Confluence Knowledge BaseApr 11, 2025