Test chaining a caught exception that may already have its cause

The Apache Derby shape behind DERBY-2472: exceptions caught in a loop are
chained with initCause, but their constructor may already have set the cause,
so the call can throw "Can't overwrite cause". The catch parameter's state is
unknown, so the call is reported.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: CatarinaGamboa

liquidjava-example/src/main/java/testSuite/classes/try_catch_error/StoreException.java

@@ -0,0 +1,8 @@
+package testSuite.classes.try_catch_error;
+
+// shape of Apache Derby's StandardException: the constructor may already set the cause
+class StoreException extends Exception {
+    StoreException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

liquidjava-example/src/main/java/testSuite/classes/try_catch_error/Test.java

@@ -168,4 +168,22 @@ static void finallyChangesVariableCheckedInTry(int x) {
         @Refinement("_ > 0")
         int z = x; // Expect: Refinement Error
     }
+
+    static void drop(int i) throws StoreException {
+        throw new StoreException("cannot drop " + i, new RuntimeException());
+    }
+
+    // a caught exception may already carry its cause (Apache Derby, DERBY-2472, fixed in 1870e8fa:
+    // chaining with initCause threw "Can't overwrite cause")
+    static void chainCaughtExceptions() throws StoreException {
+        StoreException top = null;
+        for (int i = 0; i < 2; i++) {
+            try {
+                drop(i);
+            } catch (StoreException e) {
+                e.initCause(top); // Expect: State Refinement Error
+                top = e;
+            }
+        }
+    }
 }