[1.9]Compiler error on extending Class

[Bluewolf279]

This may be user error but when i extend some minecraft classes and run the games client in idea i receive "Error:java: Compilation failed: internal java compiler error" the problem occurs just from having a class which extends the ItemArmor class or when extending the tools class (e.g. ItemPickaxe, ItemSpade,ect). the class does not have to be used anywhere just exist in my mod's source. This is strange because there was no issues in 1.8 it only occurred when i updates to 1.8.9/1.9

 

Example of what would cause a compiler error

 

  Reveal hidden contents

public class modArmor extends ItemArmor{

public modArmor(String unlocalisedName, ArmorMaterial materialIn, int renderIndexIn, EntityEquipmentSlot equipmentSlotIn) {

super(materialIn, renderIndexIn, equipmentSlotIn);

this.setUnlocalizedName(unlocalisedName);

this.setCreativeTab(ModItems.AOStab);

}

}

 

 

I am sorry in advance if my problem is user error and i have just wasted your time. i have looked for any other posts with this problem but i have not been able to find any other posts

[AnZaNaMa]

Please post the crash report/stacktrace

[Bluewolf279]

After i try to run the client in idea the folowing displays in messages make

 

  Reveal hidden contents

 

 

Information:Using javac 1.8.0_77 to compile java sources

 

Information:java: An exception has occurred in the compiler (1.8.0_77). Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program and the following diagnostic in your report. Thank you.

 

Information:java: com.sun.tools.javac.code.Symbol$CompletionFailure: class file for com.google.common.collect.Multimap not found

 

Information:java: Errors occurred while compiling module 'aos mod'

 

Information:13/05/2016 9:39 AM - Compilation completed with 1 error and 0 warnings in 22s 735ms

 

Error:java: Compilation failed: internal java compiler error

 

 

[Bluewolf279]

I Just fixed it by adding Guava to the modules dependencies.

Thank you for your time .