eclipse编译项目时报错，劳驾了.

eclipse编译项目时报错，麻烦了...

Buildfile: E:\FRONT\build.xml

init:
  [echo] initializing before compiling Proj->TMSClient

compile:
  [echo] start compiling Proj->TMSClient
  [javac] Compiling 283 source files to E:\FRONT\bin
  [javac] WARNING
  [javac] The -source switch defaults to 1.5 in JDK 1.5 and 1.6.
  [javac] If you specify -target 1.4 you now must also specify -source 1.4.
  [javac] Ant will implicitly add -source 1.4 for you. Please change your build file.

BUILD FAILED
E:\FRONT\build.xml:17: Error running javac.exe compiler

Total time: 234 milliseconds


[解决办法]
用1.6编译的吗？
build.xml中source,target都改成一样的，都用1.6

source="1.6" target="1.6"
[解决办法]
可能是你要求编译成1.4的class,并指定的jdk确不是1.4版本的。
如果用1.6就source,target 都改成1.6吧。
如果用1.5就都改成1.5