Any logging which gets enabled (via `-verbose:class` which the test uses, or externally from JTREG) and logs before the line this test is checking for with a tag set which is longer than `class,load` makes the test fail. 

Example:
Test expects: `"[class,load] Hello source: [...]"`
What it gets when logging with `class,unload` prior to this specific log line: `"[class,load ] Hello source: [...]"`

Suggested change:
```
diff --git a/test/hotspot/jtreg/runtime/cds/appcds/SignedJar.java b/test/hotspot/jtreg/runtime/cds/appcds/SignedJar.java
index 1ad28f99408..9e6cb58bb7f 100644
--- a/test/hotspot/jtreg/runtime/cds/appcds/SignedJar.java
+++ b/test/hotspot/jtreg/runtime/cds/appcds/SignedJar.java
@@ -50,8 +50,8 @@ public static void main(String[] args) throws Exception {
 
         String skipMsg = "Skipping Hello: Signed JAR";
         String lambdaInArchive = "klasses.*=.*app.*Hello[$][$]Lambda.*hidden";
-        String loadFromJar = ".class,load. Hello source: file:.*signed_hello.jar";
-        String lambdaLoadFromHello = ".class.load. Hello[$][$]Lambda.*/0x.*source.*Hello";
+        String loadFromJar = ".class,load\s*. Hello source: file:.*signed_hello.jar";
+        String lambdaLoadFromHello = ".class.load\s*. Hello[$][$]Lambda.*/0x.*source.*Hello";
 
         for (String mainArg : mainArgs) {
             output = TestCommon.dump(signedJar, TestCommon.list(mainClass),

```