It makes $r available in the code given to CtBehavior#insertBefore().

Don't try to clean-up after making a protected-final method accessible.
No synchronization with concurrent access can cause errors.

It also adds a javadoc comment to CtClass#toClass() to recommend the users to use #toClass(Class) or #toClass(Lookup).

in other words, java.lang.invoke.MethodHandles.Lookup.

Clean code according to comments.

Otherwise a normal streamhandler lookup is made and if javassist is used early on server startup protses this can lead to a deadlock on rare cases on WebSpheare.
For example. A new StreamHandlerFactory is registered but not jet fully initialized. Now javassist is used at the same time but form another thread and it will be the first one to invoke the new StreamHandlerFactory and now it can deadlock with the other thread:

Snipets from my deadlock:
3XMTHREADINFO      "main" J9VMThread:0x000000000175EC00, omrthread_t:0x00007F4120008100, java/lang/Thread:0x00000000624290B8, state:B, prio=5
3XMTHREADBLOCK     Blocked on: org/osgi/util/tracker/ServiceTracker$Tracked@0x00000000627F0A90 Owned by: "other-thread" (J9VMThread:0x0000000001B26300, java/lang/Thread:0x00000000629F1458)
3XMHEAPALLOC             Heap bytes allocated since last GC cycle=0 (0x0)
3XMTHREADINFO3           Java callstack:
4XESTACKTRACE                at org/osgi/util/tracker/ServiceTracker.getServiceReferences(ServiceTracker.java:525)
4XESTACKTRACE                at org/eclipse/osgi/framework/internal/protocol/StreamHandlerFactory.createInternalURLStreamHandler(StreamHandlerFactory.java:162)
4XESTACKTRACE                at org/eclipse/osgi/framework/internal/protocol/StreamHandlerFactory.createURLStreamHandler(StreamHandlerFactory.java:118)
4XESTACKTRACE                at java/net/URL.getURLStreamHandler(URL.java:1154)
4XESTACKTRACE                at java/net/URL.<init>(URL.java:611(Compiled Code))
4XESTACKTRACE                at java/net/URL.<init>(URL.java:502(Compiled Code))
4XESTACKTRACE                at java/net/URL.<init>(URL.java:451)
4XESTACKTRACE                at javassist/ByteArrayClassPath.find(JRebel:92)
...
4XESTACKTRACE                at java/lang/ClassLoader.loadClassHelper(ClassLoader.java:924(Compiled Code))
5XESTACKTRACE                   (entered lock: org/eclipse/core/launcher/Main$StartupClassLoader@0x0000000062F3AA88, entry count: 1)

3XMTHREADINFO      "other-thread" J9VMThread:0x0000000001B26300, omrthread_t:0x00007F4120A5D060, java/lang/Thread:0x00000000629F1458, state:B, prio=5
3XMTHREADBLOCK     Blocked on: org/eclipse/core/launcher/Main$StartupClassLoader@0x0000000062F3AA88 Owned by: "main" (J9VMThread:0x000000000175EC00, java/lang/Thread:0x00000000624290B8)
3XMHEAPALLOC             Heap bytes allocated since last GC cycle=0 (0x0)
3XMTHREADINFO3           Java callstack:
4XESTACKTRACE                at org/osgi/util/tracker/AbstractTracked.size(AbstractTracked.java:356)
4XESTACKTRACE                at org/osgi/util/tracker/ServiceTracker.getServiceReferences(ServiceTracker.java:526)
5XESTACKTRACE                   (entered lock: org/osgi/util/tracker/ServiceTracker$Tracked@0x00000000627F0A90, entry count: 1)
4XESTACKTRACE                at org/eclipse/osgi/framework/internal/protocol/StreamHandlerFactory.createInternalURLStreamHandler(StreamHandlerFactory.java:162)
4XESTACKTRACE                at org/eclipse/osgi/framework/internal/protocol/StreamHandlerFactory.createURLStreamHandler(StreamHandlerFactory.java:118)
4XESTACKTRACE                at java/net/URL.getURLStreamHandler(URL.java:1154)
4XESTACKTRACE                at java/net/URL.<init>(URL.java:611(Compiled Code))
4XESTACKTRACE                at java/net/URL.<init>(URL.java:502(Compiled Code))
4XESTACKTRACE                at java/net/URL.<init>(URL.java:451)
4XESTACKTRACE                at java/net/URI.toURL(URI.java:1100)
4XESTACKTRACE                at com/ibm/jsse2/av.a(av.java:92)
4XESTACKTRACE                at com/ibm/jsse2/av.engineInit(av.java:7)
4XESTACKTRACE                at javax/net/ssl/TrustManagerFactory.init(TrustManagerFactory.java:25)

Applied fix for #152 "Wrong modifiers returned for nested classes" as suggested by @pietrobraione.
Includes unit tests for all access modifiers and static.

Applied parameters and squashed all compiler warnings.
Changed loops to enhanced for where appropriate.
Fixed SoftValueHashMap:
Made it a raw type.
Overwritten implementation of the `get` method correctly unwrapped the reference but the methods
`containsValue` and `entrySet` needed to be fixed.
Implemented the remaining outstanding methods from the `java.util.Map` contract `values`, `putAll`
and `keySet`.
Dropped `AbstractMap` inheritance as we were not inheriting anything anymore.
Changed internal map to `ConcurrentHashMap' to be atomic and parallel safe.

Found original unit tests from jboss retro which are now updated to reflect the javassist
versions of the scoped pool classes. Added tests for the SoftValueHashMap including
test which overloads the heap to ensure the cache cleans itself appropriately.

Runtime still throws warnings illegal actions even after all that, there's
just no logic to it. We can use Unsafe but don't touch setAccessible. O well
might as well enjoy Unsafe while we still can.

Wrapped the Unsafe and added method cache with varargs method for invoke calls.
Can still do a lot with it but it does what it needs to for now.

Yes it is deprecated but seems the right thing to do

Wont stop you from getting an instance but it makes it more trouble at least.
Also reduce the visibility of the enum method.

The only thing remotely inforceable is caller class checking. You cannot
bypass an exception with setAccesible. Oracle went and removed
Reflection.getCallerClass() completely in favour of StackWalker. At least
we can share the SecurityManage ClassContext, SecurityActions seems the
appropriate venue for our stack trace peek to support the older versions

Java 7 and 8 does support method handles so we can cater for them. When doing
repeated invokes to the same method, keeping a reference to the Method handle
is much faster than reflection. Also the API is cleaner not having to Object[]
args etc. Worth the effort...

Remembered that 1.6 won't know about MethodHandles so must use reflection methods for them still.

Also do it anonomously so as not to raise the alarms and upset the powers to be.

Some whitespace got shunted around a bit too.

The main advantage is that we can do the privileged setAccessible during creation and
then freely invoke via the authorized method handle.

As per the javadocs:
Access checks are applied in the factory methods of Lookup, when a method handle is created.
his is a key difference from the Core Reflection API, since java.lang.reflect.Method.invoke
performs access checking against every caller, on every call.

The performance boost is just a bonus.

Oracle (or maybe it was still Sun) warns that we should prevent from exposing access we gain to
privileged functionality like the unsafe etc. Before Oracle decides to restrict us even more lets
make an effort at least.