Gradle and Lambda notations of Java 8

Help/Discuss
1

Hi,

My team has recently upgraded to Java 8. We have a file which uses Lambda notations of Java 8. Gradle fails to compile this file. Here’s what we have tried to fix:

  1. Check and make sure JAVA_HOME is set to java 1.8

  2. Check and make sure that gradle is using the correct version of java- gradle -version give the following
    Groovy: 2.3.10
    Ant: Apache Ant™ version 1.9.3 compiled on December 23 2013
    JVM: 1.8.0_60 (Oracle Corporation 25.60-b23)
    OS: Mac OS X 10.9.5 x86_64

  3. Tried to explicitly set java to 8 by setting
    compileJava.setSourceCompatibility(‘1.8’)
    compileJava.setTargetCompatibility(‘1.8’)

  4. tried to set org.gradle.java.home=’/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home’

It seems like the problem is with only one file. Searched the internet and didn’t find any information about this specific issue. Can anyone help me with this?

Thanks,
Deep

2

If you check the .class files that were created, are they version 52? You can check with file path/to/some.class

Are the compilation errors related to the lambda or missing dependencies or something else? Can you post them?

3

IntelliJ is complaining saying that it wasn’t able to resolve import java.util.function.Function dependency of Java 8

So it is basically a dependency issue.

4

Found a fix for the issue. It is not related to gradle, it is related to the installation of JDK 1.8.0_60

I checked that javac -version = 1.7
there are other people facing this issue.

I had to do

sudo rm -rf /Library/Java/Extensions

to fix it.

5

Thanks.

So was gradle -version reporting a 1.8 JVM?

Glad you got things working.