xbean-reflect/src/main/java/org/apache/xbean/recipe/AsmParameterNameLoader.java [51:112]:
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    private final WeakHashMap<Constructor,List<String>> constructorCache = new WeakHashMap<Constructor,List<String>>();

    /**
     * Weak map from Method to List&lt;String&gt;.
     */
    private final WeakHashMap<Method,List<String>> methodCache = new WeakHashMap<Method,List<String>>();

    /**
     * Gets the parameter names of the specified method or null if the class was compiled without debug symbols on.
     * @param method the method for which the parameter names should be retrieved
     * @return the parameter names or null if the class was compilesd without debug symbols on
     */
    public List<String> get(Method method) {
        // check the cache
        if (methodCache.containsKey(method)) {
            return methodCache.get(method);
        }

        Map<Method,List<String>> allMethodParameters = getAllMethodParameters(method.getDeclaringClass(), method.getName());
        return allMethodParameters.get(method);
    }

    /**
     * Gets the parameter names of the specified constructor or null if the class was compiled without debug symbols on.
     * @param constructor the constructor for which the parameters should be retrieved
     * @return the parameter names or null if the class was compiled without debug symbols on
     */
    public List<String> get(Constructor constructor) {
        // check the cache
        if (constructorCache.containsKey(constructor)) {
            return constructorCache.get(constructor);
        }

        Map<Constructor,List<String>> allConstructorParameters = getAllConstructorParameters(constructor.getDeclaringClass());
        return allConstructorParameters.get(constructor);
    }

    /**
     * Gets the parameter names of all constructor or null if the class was compiled without debug symbols on.
     * @param clazz the class for which the constructor parameter names should be retrieved
     * @return a map from Constructor object to the parameter names or null if the class was compiled without debug symbols on
     */
    public Map<Constructor,List<String>> getAllConstructorParameters(Class clazz) {
        // Determine the constructors?
        List<Constructor> constructors = new ArrayList<Constructor>(Arrays.asList(clazz.getConstructors()));
        constructors.addAll(Arrays.asList(clazz.getDeclaredConstructors()));
        if (constructors.isEmpty()) {
            return Collections.emptyMap();
        }

        // Check the cache
        if (constructorCache.containsKey(constructors.get(0))) {
            Map<Constructor,List<String>> constructorParameters = new HashMap<Constructor,List<String>>();
            for (Constructor constructor : constructors) {
                constructorParameters.put(constructor, constructorCache.get(constructor));
            }
            return constructorParameters;
        }

        // Load the parameter names using ASM
        Map<Constructor,List<String>> constructorParameters = new HashMap<Constructor,List<String>> ();
        try {
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xbean-reflect/src/main/java/org/apache/xbean/recipe/XbeanAsmParameterNameLoader.java [51:112]:
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    private final WeakHashMap<Constructor,List<String>> constructorCache = new WeakHashMap<Constructor,List<String>>();

    /**
     * Weak map from Method to List&lt;String&gt;.
     */
    private final WeakHashMap<Method,List<String>> methodCache = new WeakHashMap<Method,List<String>>();

    /**
     * Gets the parameter names of the specified method or null if the class was compiled without debug symbols on.
     * @param method the method for which the parameter names should be retrieved
     * @return the parameter names or null if the class was compilesd without debug symbols on
     */
    public List<String> get(Method method) {
        // check the cache
        if (methodCache.containsKey(method)) {
            return methodCache.get(method);
        }

        Map<Method,List<String>> allMethodParameters = getAllMethodParameters(method.getDeclaringClass(), method.getName());
        return allMethodParameters.get(method);
    }

    /**
     * Gets the parameter names of the specified constructor or null if the class was compiled without debug symbols on.
     * @param constructor the constructor for which the parameters should be retrieved
     * @return the parameter names or null if the class was compiled without debug symbols on
     */
    public List<String> get(Constructor constructor) {
        // check the cache
        if (constructorCache.containsKey(constructor)) {
            return constructorCache.get(constructor);
        }

        Map<Constructor,List<String>> allConstructorParameters = getAllConstructorParameters(constructor.getDeclaringClass());
        return allConstructorParameters.get(constructor);
    }

    /**
     * Gets the parameter names of all constructor or null if the class was compiled without debug symbols on.
     * @param clazz the class for which the constructor parameter names should be retrieved
     * @return a map from Constructor object to the parameter names or null if the class was compiled without debug symbols on
     */
    public Map<Constructor,List<String>> getAllConstructorParameters(Class clazz) {
        // Determine the constructors?
        List<Constructor> constructors = new ArrayList<Constructor>(Arrays.asList(clazz.getConstructors()));
        constructors.addAll(Arrays.asList(clazz.getDeclaredConstructors()));
        if (constructors.isEmpty()) {
            return Collections.emptyMap();
        }

        // Check the cache
        if (constructorCache.containsKey(constructors.get(0))) {
            Map<Constructor,List<String>> constructorParameters = new HashMap<Constructor,List<String>>();
            for (Constructor constructor : constructors) {
                constructorParameters.put(constructor, constructorCache.get(constructor));
            }
            return constructorParameters;
        }

        // Load the parameter names using ASM
        Map<Constructor,List<String>> constructorParameters = new HashMap<Constructor,List<String>> ();
        try {
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