test/tools/jdeps/modules/UnnamedPackage.java
test/tools/jdeps/modules/GenModuleInfo.java

may fail on windows.

--- a/src/jdk.jdeps/share/classes/com/sun/tools/jdeps/JdepsTask.java
+++ b/src/jdk.jdeps/share/classes/com/sun/tools/jdeps/JdepsTask.java
@@ -680,9 +680,9 @@
     private boolean genModuleInfo(JdepsConfiguration config) throws IOException {
         // check if any JAR file contains unnamed package
         for (String arg : inputArgs) {
+ try (ClassFileReader reader = ClassFileReader.newInstance(Paths.get(arg))) {
             Optional<String> classInUnnamedPackage =
- ClassFileReader.newInstance(Paths.get(arg))
- .entries().stream()
+ reader.entries().stream()
                     .filter(n -> n.endsWith(".class"))
                     .filter(cn -> toPackageName(cn).isEmpty())
                     .findFirst();
@@ -696,6 +696,7 @@
                 return false;
             }
         }
+ }