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https://issues.apache.org/jira/browse/KARAF-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13450599#comment-13450599
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Raphael Majeed commented on KARAF-1799:
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Better solution for JAVA_HOME autodiscovery: use "REG QUERY ..." (available
since WinXP)
e.g. try running
{code}
REG QUERY "HKLM\Software\JavaSoft\Java Runtime Environment" /v CurrentVersion
REG QUERY "HKLM\Software\JavaSoft\Java Runtime Environment\1.6" /v JavaHome
{code}
in the console.
See also
http://www.chriskopec.com/blog/2009/jun/15/automatic-discovery-java_home-batch-file/
> JAVA_HOME autodiscovery not working on Windows 7 (karaf.bat)
> ------------------------------------------------------------
>
> Key: KARAF-1799
> URL: https://issues.apache.org/jira/browse/KARAF-1799
> Project: Karaf
> Issue Type: Bug
> Components: karaf-os-integration
> Affects Versions: 2.2.9
> Environment: Windows 7 Professional, JDK 1.6.0_35, JDK 1.7.0_07,
> jre6, jre7
> Reporter: Raphael Majeed
>
> When running karaf.bat without setting JAVA_HOME, karaf.bat tries to
> determine JAVA_HOME automatically.
> The following happens on Windows 7:
> 1. The built in windows security manager asks for permission to allow regedit
> to access the registry twice.
> 2. karaf.bat exits with message "Unable to retrieve JAVA_HOME"
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