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[DOCS] Add more instructions about jar hell #26837

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[DOCS] Add more instructions about jar hell #26837

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13 changes: 10 additions & 3 deletions CONTRIBUTING.md
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Expand Up @@ -106,9 +106,16 @@ then `File->New Project From Existing Sources`. Point to the root of
the source directory, select
`Import project from external model->Gradle`, enable
`Use auto-import`. Additionally, in order to run tests directly from
IDEA 2017.2 and above it is required to disable IDEA run launcher,
which can be achieved by adding `-Didea.no.launcher=true`
[JVM option](https://intellij-support.jetbrains.com/hc/en-us/articles/206544869-Configuring-JVM-options-and-platform-properties)
IDEA 2017.2 and above it is required to disable IDEA run launcher to avoid
finding yourself in "jar hell", which can be achieved by adding the
`-Didea.no.launcher=true` [JVM
option](https://intellij-support.jetbrains.com/hc/en-us/articles/206544869-Configuring-JVM-options-and-platform-properties)
or by adding `idea.no.launcher=true` to the
`idea.properties`[https://www.jetbrains.com/help/idea/file-idea-properties.html]
file which can be accessed under Help > Edit Custom Properties within IDEA. You
may also need to [remove `ant-javafx.jar` from your
classpath][https://github.com/elastic/elasticsearch/issues/14348] if that is
reported as a source of jar hell.

The Elasticsearch codebase makes heavy use of Java `assert`s and the
test runner requires that assertions be enabled within the JVM. This
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