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Set JAVA_HOME env var to OpenJDK 8 for Android builds#638

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aneeshusa:set-java-home
Apr 18, 2017
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Set JAVA_HOME env var to OpenJDK 8 for Android builds#638
bors-servo merged 1 commit intoservo:masterfrom
aneeshusa:set-java-home

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@aneeshusa aneeshusa commented Apr 17, 2017 •
edited by larsbergstrom
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The new gradle builds require Java 8,
and the existing ant builds also work with Java 8.

This is easier than running many update-alternatives calls from Salt.
Moreover, this allows keeping Java 7 installed together with Java 8.

Needed for servo/servo#15773.
Follow-up to to #617 and #629.

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aneeshusa commented Apr 17, 2017

@MortimerGoro can you please confirm that JAVA_HOME works with the ant build, so we don't break the current Android build?

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MortimerGoro commented Apr 18, 2017 •
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@aneeshusa I ran some tests in my machine:

Gradle

  • Compiles ok with JAVA_HOME set to Java8 (/usr/lib/jvm/java-8-openjdk-amd64)
  • Fails as expected with JAVA_HOME set to Java 7 (/usr/lib/jvm/java-7-openjdk-amd64): Unsupported major.minor version 52.0

Ant

  • Compiles ok with JAVA_HOME set to Java8 (/usr/lib/jvm/java-8-openjdk-amd64)
  • Compiles ok with JAVA_HOME set to Java 7 (/usr/lib/jvm/java-7-openjdk-amd64)
  • Fails as expected when setting an invalid JAVA_HOME folder: Error: JAVA_HOME is not defined correctly. This confirms that ant takes JAVA_HOME into account.

My environment:

  • Both java7 and java8 installed on Ubuntu 16.04.
  • Both android-18 and android-25 APIs installed.
  • Android tools v25.2.5. Important: Android tools >= v25.3.x breaks the old build system because they deprecated android cli command.

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MortimerGoro commented Apr 18, 2017

Based on these tests setting JAVA_HOME env variable seems safe.

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aneeshusa commented Apr 18, 2017

Thanks so much @MortimerGoro! This is ready for review, r? @larsbergstrom

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larsbergstrom commented Apr 18, 2017

This means that we're probably not going to support cross-compiling from OSX, right? @fabricedesre Is that OK with you?

I know that the OSX cross builds have been broken for a little while (don't test => eventually breaks), but this seems to explicitly move us down a road of Linux-only cross builds. Unless that directory should also be present on OSX, too?

Otherwise, I'm fine with this, assuming it passes a try!

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fabricedesre commented Apr 18, 2017

I don't personally care about cross compiling from OSX, being a linux user. go ahead!

@aneeshusa
Set JAVA_HOME env var to OpenJDK 8 for Android builds
ca86297 
The new gradle builds require Java 8,
and the existing ant builds also work with Java 8.

This is easier than running many `update-alternatives` calls from Salt.
Moreover, this allows keeping Java 7 installed together with Java 8.
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aneeshusa commented Apr 18, 2017

@larsbergstrom JAVA_HOME is not required in general, we're only using it to point to Java 8 instead of Java 7 on the builders. macOS builds should still work if only Java 8 is installed, or else I believe there are similar directories JAVA_HOME can be set to.

It does make sense to template this in the future, though, so I've added a comment to that effect.
@bors-servo r=larsbergstrom

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bors-servo commented Apr 18, 2017

📌 Commit ca86297 has been approved by larsbergstrom

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bors-servo commented Apr 18, 2017

⌛ Testing commit ca86297 with merge de820a3...

bors-servo pushed a commit that referenced this pull request Apr 18, 2017
Auto merge of #638 - aneeshusa:set-java-home, r=larsbergstrom
de820a3 
Set JAVA_HOME env var to OpenJDK 8 for Android builds

The new gradle builds require Java 8,
and the existing ant builds also work with Java 8.

This is easier than running many `update-alternatives` calls from Salt.
Moreover, this allows keeping Java 7 installed together with Java 8.

Needed for servo/servo#15773.
Follow-up to to #617 and #629.

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bors-servo commented Apr 18, 2017

☀️ Test successful - status-travis
Approved by: larsbergstrom
Pushing de820a3 to master...

@bors-servo bors-servo merged commit ca86297 into servo:master Apr 18, 2017
@bors-servo bors-servo mentioned this pull request Apr 18, 2017
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@aneeshusa aneeshusa mentioned this pull request Apr 20, 2017
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@larsbergstrom larsbergstrom mentioned this pull request Apr 20, 2017
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@aneeshusa @MortimerGoro @larsbergstrom @fabricedesre @bors-servo @highfive