Gradle, Javadoc and JDK version

Multi tool use
Multi tool use


Gradle, Javadoc and JDK version



I have multiple JDKs installed.



In my build.gradle, I set sourceCompatibility = 1.8 to ensure the right one is used. This works fine.


sourceCompatibility = 1.8



However, this seems to be ignored by the Javadoc task (./gradlew javadoc), which fails with an error (error: package sun.net.www.protocol.http is not visible) -- from this question I learned that this is an issue with a new feature in Java 9.


./gradlew javadoc


error: package sun.net.www.protocol.http is not visible



As of now, the project is aimed at Java 8 only. One day it will be upgraded to Java 9, but not today, so I just want to use the Java 8 javadoc generator instead of the Java 9 version.



I checked the task documentation but it doesn't look like there's any option to specify a JDK version. What can I do?



I'm expecting the solution to be a Gradle configuration, so it can be easily shared with the other devs on different machines.



Gradle version in which the behavior was seen (installed through IntelliJ):


------------------------------------------------------------
Gradle 4.4
------------------------------------------------------------

Build time: 2017-12-06 09:05:06 UTC
Revision: cf7821a6f79f8e2a598df21780e3ff7ce8db2b82

Groovy: 2.4.12
Ant: Apache Ant(TM) version 1.9.9 compiled on February 2 2017
JVM: 10.0.1 (Oracle Corporation 10.0.1+10-Debian-4)
OS: Linux 4.16.0-2-amd64 amd64



Gradle version in which there was a warning instead of a failure of the Javadoc task (installed through Debian's repos):


------------------------------------------------------------
Gradle 3.4.1
------------------------------------------------------------

Build time: 2012-12-21 00:00:00 UTC
Revision: none

Groovy: 2.4.15
Ant: Apache Ant(TM) version 1.10.3 compiled on June 13 2018
JVM: 10.0.1 (Oracle Corporation 10.0.1+10-Debian-4)
OS: Linux 4.16.0-2-amd64 amd64



Edit -- I have found this page that specifies that a "-source release" parameter that is probably the solution to this problem, however I cannot find the way it should be called:


javadoc {
options.addStringOption('-source', '8')
}



This compiles & runs with no warnings (in build.gradle), but doesn't change anything and doesn't appear in /build/tmp/javadoc/javadoc.options.


build.gradle


/build/tmp/javadoc/javadoc.options





In case it wasn't clear, tasks such as 'build' or 'test' work fine without errors on the JDK8 as expected. It's only the Javadoc task that fails.
– CLOVIS
Jul 2 at 12:18





Setting the source compatibility doesn't select a JDK. As you see in your output, you're using Java 10.0.1. Gradle uses the Java version that is in your PATH.
– JB Nizet
Jul 4 at 14:53






Both Java 8 & Java 10 are in my PATH. I want the javadoc doclet to run with Java 8 because some features (like the HTTP classes) were changed in Java 9
– CLOVIS
Jul 4 at 15:39





You shouldn't have two different versions of the JDK in your path. The first one will be picked anyway.
– JB Nizet
Jul 4 at 15:40





@JBNizet I can't change that now, I need both for different projects
– CLOVIS
Jul 5 at 11:59




1 Answer
1



I changed the version available in the path by doing:


export JAVA_HOME=/usr/lib/jvm/default-java






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