Avoid security manager check for assembly class loaders. The runtime should be priviliged to create the default assembly class loader and a custom security manager might recursively require the assembly class loader to be loaded (which is only "supported" for custom assembly class loaders).

classpath/ikvm/internal/AssemblyClassLoader.java

@@ -43,7 +43,13 @@ public final class AssemblyClassLoader extends ClassLoader
 
     public AssemblyClassLoader(Assembly assembly)
     {
-        super(null);
+        this(assembly, System.getSecurityManager());
+    }
+
+    // this constructor is used by the runtime to avoid the security check (by passing in null as the security manager)    
+    AssemblyClassLoader(Assembly assembly, SecurityManager security)
+    {
+        super(null, security);
         this.assembly = assembly;
     }
 

openjdk/java/lang/ClassLoader.java

@@ -216,7 +216,13 @@ public abstract class ClassLoader {
      * @since  1.2
      */
     protected ClassLoader(ClassLoader parent) {
-        SecurityManager security = System.getSecurityManager();
+        this(parent, System.getSecurityManager());
+    }
+
+    // private constructor for use by ikvm.runtime.AssemblyClassLoader
+    // (to skip the security manager check)
+    @ikvm.lang.Internal
+    protected ClassLoader(ClassLoader parent, SecurityManager security) {
         if (security != null) {
             security.checkCreateClassLoader();
         }

runtime/AssemblyClassLoader.cs

@@ -1159,7 +1159,7 @@ namespace IKVM.Internal
 
 			public object run()
 			{
-				return new ikvm.runtime.AssemblyClassLoader(assembly);
+				return new ikvm.runtime.AssemblyClassLoader(assembly, null);
 			}
 		}