Rescan the classpath when seeing many AutofillConstructionExceptions

2 files changed, 9 insertions, 0 deletions

diff --git a/agent/src/main/java/com/code_intelligence/jazzer/autofuzz/FuzzTarget.java b/agent/src/main/java/com/code_intelligence/jazzer/autofuzz/FuzzTarget.java
index 9cb74a11..0cc967bb 100644
--- a/agent/src/main/java/com/code_intelligence/jazzer/autofuzz/FuzzTarget.java
+++ b/agent/src/main/java/com/code_intelligence/jazzer/autofuzz/FuzzTarget.java
@@ -172,6 +172,11 @@ public class FuzzTarget {
         System.err.printf("Failed to generate valid arguments to '%s' in %d attempts; giving up%n",
             methodReference, executionsSinceLastInvocation);
         System.exit(1);
+      } else if (executionsSinceLastInvocation >= MAX_EXECUTIONS_WITHOUT_INVOCATION / 2) {
+        // The application under test might perform classpath modifications or create classes
+        // dynamically that implement interfaces or extend abstract classes. Rescanning the
+        // classpath might help with constructing objects.
+        Meta.rescanClasspath();
       }
     } catch (AutofuzzInvocationException e) {
       executionsSinceLastInvocation = 0;
diff --git a/agent/src/main/java/com/code_intelligence/jazzer/autofuzz/Meta.java b/agent/src/main/java/com/code_intelligence/jazzer/autofuzz/Meta.java
index f151dea0..1f35c0a4 100644
--- a/agent/src/main/java/com/code_intelligence/jazzer/autofuzz/Meta.java
+++ b/agent/src/main/java/com/code_intelligence/jazzer/autofuzz/Meta.java
@@ -234,6 +234,10 @@ public class Meta {
     }
   }
 
+  static void rescanClasspath() {
+    implementingClassesCache.clear();
+  }
+
   static boolean isTest() {
     String value = System.getenv("JAZZER_AUTOFUZZ_TESTING");
     return value != null && !value.isEmpty();