keep Runnable r strongly reachable so that it is not reclaimable by GC

JasonFengJ9 · JasonFengJ9 · commit 026c6f83b406 · 2024-10-02T09:24:18.000-04:00
The GC might occur before the second native library loading by another
class loader, keep Runnable r strongly reachable so that it is not
reclaimable by GC, and ensure UnsatisfiedLinkError.

Signed-off-by: Jason Feng &lt;fengj@ca.ibm.com&gt;
diff --git a/test/jdk/java/lang/ClassLoader/nativeLibrary/NativeLibraryTest.java b/test/jdk/java/lang/ClassLoader/nativeLibrary/NativeLibraryTest.java
@@ -97,6 +97,8 @@ static void runTest() throws Exception {
             throw new RuntimeException("should fail to load the native library" +
                     " by another class loader");
         } catch (UnsatisfiedLinkError e) {}
+        // keep Runnable r strongly reachable so that it is not reclaimable by GC
+        java.lang.ref.Reference.reachabilityFence(r);
     }
 
     /*

Original file line number	Diff line number	Diff line change
`@@ -97,6 +97,8 @@ static void runTest() throws Exception {`
`97`	`97`	`throw new RuntimeException("should fail to load the native library" +`
`98`	`98`	`" by another class loader");`
`99`	`99`	`} catch (UnsatisfiedLinkError e) {}`
	`100`	`+ // keep Runnable r strongly reachable so that it is not reclaimable by GC`
	`101`	`+ java.lang.ref.Reference.reachabilityFence(r);`
`100`	`102`	`}`
`101`	`103`
`102`	`104`	`/*`