Fix Java exec exception 'UNC path is missing sharename' (#352)

Author: testforstephen

com.microsoft.java.debug.plugin/src/main/java/com/microsoft/java/debug/plugin/internal/ResolveJavaExecutableHandler.java

@@ -90,7 +90,9 @@ private static File findJavaExecutable(File vmInstallLocation) {
                 if (!isBin && j == 0) {
                     continue;
                 }
-                File javaFile = new File(vmInstallLocation, Paths.get(javaBinCandidates[j], javaExecCandidates[i]).toString());
+
+                String execRelativePath = j == 0 ? javaExecCandidates[i] : Paths.get(javaBinCandidates[j], javaExecCandidates[i]).toString();
+                File javaFile = new File(vmInstallLocation, execRelativePath);
                 if (javaFile.isFile()) {
                     return javaFile;
                 }