[mkgmap-dev] mkgmap does not compile with Java 8

Fri Jul 11 14:48:37 BST 2014

Hello,

I hope this is not a FAQ, but I couldn't find an answer anywhere.

When I am trying to compile mkgmap with

java version "1.8.0_05"
Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode)

running on Windows 7 64 Bit, I get the following errors:

compile:
     [javac] Compiling 480 source files to F:\mkgmap\trunk\build\classes
     [javac] warning: [options] bootstrap class path not set in 
conjunction with -source 1.7
     [javac] 
F:\mkgmap\trunk\src\uk\me\parabola\util\MultiHashMap.java:57: error: 
name clash: remove(K,V) in MultiHashMap and remove(Object,Object) in 
HashMap have the same erasure, yet neither overrides the other
     [javac]     public V remove(K key, V value )
     [javac]              ^
     [javac]   where K,V are type-variables:
     [javac]     K extends Object declared in class MultiHashMap
     [javac]     V extends Object declared in class MultiHashMap
     [javac] 
F:\mkgmap\trunk\src\uk\me\parabola\util\MultiIdentityHashMap.java:57: 
error: name clash: remove(K,V) in MultiIdentityHashMap and 
remove(Object,Object) in Map have the same erasure, yet neither 
overrides the other
     [javac]     public V remove(K key, V value )
     [javac]              ^
     [javac]   where K,V are type-variables:
     [javac]     K extends Object declared in class MultiIdentityHashMap
     [javac]     V extends Object declared in class MultiIdentityHashMap
     [javac] Note: 
F:\mkgmap\trunk\src\uk\me\parabola\mkgmap\reader\dem\DEM.java uses 
unchecked or unsafe operations.
     [javac] Note: Recompile with -Xlint:unchecked for details.
     [javac] 2 errors
     [javac] 1 warning

BUILD FAILED

Is this a known problem? What can I do besides reverting to Java 7?

Thank you,

Michael