diff --git a/src/main/java/tcl/lang/Interp.java b/src/main/java/tcl/lang/Interp.java
index 539cfb3..e883c14 100644
--- a/src/main/java/tcl/lang/Interp.java
+++ b/src/main/java/tcl/lang/Interp.java
@@ -374,7 +374,8 @@ public class Interp extends EventuallyFreed {
 	// List of unsafe commands:
 
 	static final String[] unsafeCmds = { "encoding", "exit", "load", "cd", "fconfigure", "file", "glob", "open", "pwd",
-			"socket", "beep", "echo", "ls", "resource", "source", "exec", "source" };
+			"socket", "beep", "echo", "ls", "resource", "source", "exec", "jaclloadjava", "jaclloadtjc",
+			"auto_execok", "auto_import", "auto_load", "auto_load_index", "auto_qualify"};
 
 	// Flags controlling the call of invoke.
 
diff --git a/src/main/java/tcl/pkg/java/ReflectObject.java b/src/main/java/tcl/pkg/java/ReflectObject.java
index 85465c3..4591dcc 100644
--- a/src/main/java/tcl/pkg/java/ReflectObject.java
+++ b/src/main/java/tcl/pkg/java/ReflectObject.java
@@ -532,7 +532,7 @@ else if (cl == Void.TYPE)
 
 		ReflectObject roRep = findInReflectTable(interp, cl, obj);
 
-		if (roRep != null) {
+		if (roRep != null && roRep.isValid) {
 			// If it is already in the table just increment the use count and
 			// return it
 
@@ -931,6 +931,7 @@ public void disposeCmd() {
 		}
 
 		isValid = false;
+		dispose();
 	}
 
 	/*