JarVerifier causing slow service lookup on JBoss EAP 5

Issue

There is a reasonable amount of object churn reported by profiling tools, and thread dumps show the following calls showing up often which is called from code doing a service lookup.

    at java.util.HashMap.createEntry(HashMap.java:901)
    at java.util.HashMap.addEntry(HashMap.java:888)
    at java.util.HashMap.put(HashMap.java:509)
    at java.util.jar.Attributes.put(Attributes.java:148)
    at java.util.jar.Attributes.putValue(Attributes.java:168)
    at java.util.jar.Attributes.read(Attributes.java:421)
    at java.util.jar.Manifest.read(Manifest.java:251)
    at sun.security.util.SignatureFileVerifier.processImpl(SignatureFileVerifier.java:206)
    at sun.security.util.SignatureFileVerifier.process(SignatureFileVerifier.java:193)
    at java.util.jar.JarVerifier.processEntry(JarVerifier.java:305)
    at java.util.jar.JarVerifier.update(JarVerifier.java:216)
    at java.util.jar.JarFile.initializeVerifier(JarFile.java:345)
    at java.util.jar.JarFile.getInputStream(JarFile.java:412)
    - locked <0x00000006905c1bf0> (a sun.net.www.protocol.jar.URLJarFile)
    at sun.net.www.protocol.jar.JarURLConnection.getInputStream(JarURLConnection.java:162)
    at java.net.URLClassLoader.getResourceAsStream(URLClassLoader.java:233)
    ...