Issue building TFM

[ghost]

I get these errors when I try to build TFM. Any solutions to resolve this issue?

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COMPILATION ERROR :

me/totalfreedom/totalfreedommod/admin/AdminList.java:[53,9] cannot access java.util.function.Function
class file for java.util.function.Function not found
me/totalfreedom/totalfreedommod/admin/AdminList.java:[54,13] method does not override or implement a method from a supertype
2 errors

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BUILD FAILURE

Total time: 18.518s
Finished at: Mon Jan 08 18:16:12 GMT 2018
Final Memory: 21M/238M

Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.3:compile (default-compile) on project totalfreedom: Compilation failure: Compilation failure:
me/totalfreedom/totalfreedommod/admin/AdminList.java:[53,9] cannot access java.util.function.Function
class file for java.util.function.Function not found
me/totalfreedom/totalfreedommod/admin/AdminList.java:[54,13] method does not override or implement a method from a supertype
[Help 1]

To see the full stack trace of the errors, re-run Maven with the -e switch.
Re-run Maven using the -X switch to enable full debug logging.

For more information about the errors and possible solutions, please read the following articles:
[Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

[Wild1145]

What branch are you trying to build?

[ghost]

The branch i'm using is TFM1.12-Alpha

[Wild1145]

Have you made any changes to the code?

[ghost]

No. All I did was clone TFM and add the lib folder. No errors appear after compiling, but the error above for some reason keeps showing and failing to build when I build the plugin.

[JeromSar]

What version of Java are you building with? We recommend at least JDK 1.7

[Wild1145]

@poppy44 The alpha branch contains fully automated maven building. Try running a clean & build instead of just a build, if not re-clone it and DO NOT add the lib folder this time, just launch the project and compile it with maven.

[ghost]

I'm using JDK version 1.7.0_80

[ghost]

oh Wild I forgot to mention. When I was building it, I was selecting clean and build the whole time.

[ghost]

@Wild1145 how do I compile it with maven? when I cloned TFM from git, it also came with the lib folder.

[JeromSar]

I see the issue. Whilst TotalFreedomMod should be compiled with JDK 1.7 (as indicated in pom.xml), it actually uses JDK 8 functionality (namely java.util.function.Function). This is a bug, but there's no fix right now. For now, I recommend upgrading to JDK 8.

[ghost]

It works now, seems the older version of JDK I used was causing it to fail at building. Thanks for the help. :)