Duplicate class path during launching

[andxu]

0:
"N:\testall\target\classes"
1:
"N:\testall\target\classes"
2:
"N:\testall\target\test-classes"
3:
"N:\testall\target\test-classes"

0 and 1, 2 and 3 are duplicate

[andxu]

microsoft/java-debug#223