geronimo-el_2.2_spec/src/main/java/javax/el/BeanELResolver.java - geronimo-specs - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.
  * The ASF licenses this file to You under the Apache License, Version 2.0
  * (the "License"); you may not use this file except in compliance with
  * the License.  You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package javax.el;

 import java.beans.BeanInfo;
 import java.beans.FeatureDescriptor;
 import java.beans.IntrospectionException;
 import java.beans.Introspector;
 import java.beans.PropertyDescriptor;
 import java.lang.reflect.Array;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.WeakHashMap;
 import java.util.concurrent.ConcurrentHashMap;


 public class BeanELResolver extends ELResolver {

     private final boolean readOnly;

     private final ConcurrentCache<String, BeanProperties> cache = new ConcurrentCache<String, BeanProperties>(
             1000);

     public BeanELResolver() {
         this.readOnly = false;
     }

     public BeanELResolver(boolean readOnly) {
         this.readOnly = readOnly;
     }

     public Object getValue(ELContext context, Object base, Object property)
             throws NullPointerException, PropertyNotFoundException, ELException {
         if (context == null) {
             throw new NullPointerException();
         }
         if (base == null || property == null) {
             return null;
         }

         context.setPropertyResolved(true);
         Method m = this.property(context, base, property).read(context);
         try {
             return m.invoke(base, (Object[]) null);
         } catch (IllegalAccessException e) {
             throw new ELException(e);
         } catch (InvocationTargetException e) {
             throw new ELException(message(context, "propertyReadError",
                     new Object[] { base.getClass().getName(),
                             property.toString() }), e.getCause());
         } catch (Exception e) {
             throw new ELException(e);
         }
     }

     public Class<?> getType(ELContext context, Object base, Object property)
             throws NullPointerException, PropertyNotFoundException, ELException {
         if (context == null) {
             throw new NullPointerException();
         }
         if (base == null || property == null) {
             return null;
         }

         context.setPropertyResolved(true);
         return this.property(context, base, property).getPropertyType();
     }

     public void setValue(ELContext context, Object base, Object property,
             Object value) throws NullPointerException,
             PropertyNotFoundException, PropertyNotWritableException,
             ELException {
         if (context == null) {
             throw new NullPointerException();
         }
         if (base == null || property == null) {
             return;
         }

         context.setPropertyResolved(true);

         if (this.readOnly) {
             throw new PropertyNotWritableException(message(context,
                     "resolverNotWriteable", new Object[] { base.getClass()
                             .getName() }));
         }

         Method m = this.property(context, base, property).write(context);
         try {
             m.invoke(base, value);
         } catch (IllegalAccessException e) {
             throw new ELException(e);
         } catch (InvocationTargetException e) {
             throw new ELException(message(context, "propertyWriteError",
                     new Object[] { base.getClass().getName(),
                             property.toString() }), e.getCause());
         } catch (Exception e) {
             throw new ELException(e);
         }
     }

     public boolean isReadOnly(ELContext context, Object base, Object property)
             throws NullPointerException, PropertyNotFoundException, ELException {
         if (context == null) {
             throw new NullPointerException();
         }
         if (base == null || property == null) {
             return false;
         }

         context.setPropertyResolved(true);
         return this.readOnly
                 || this.property(context, base, property).isReadOnly();
     }

     public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
         if (context == null) {
             throw new NullPointerException();
         }

         if (base == null) {
             return null;
         }

         try {
             BeanInfo info = Introspector.getBeanInfo(base.getClass());
             PropertyDescriptor[] pds = info.getPropertyDescriptors();
             for (PropertyDescriptor pd : pds) {
                 pd.setValue(RESOLVABLE_AT_DESIGN_TIME, Boolean.TRUE);
                 pd.setValue(TYPE, pd.getPropertyType());
             }
             return Arrays.asList((FeatureDescriptor[]) pds).iterator();
         } catch (IntrospectionException e) {
             //
         }

         return null;
     }

     public Class<?> getCommonPropertyType(ELContext context, Object base) {
         if (context == null) {
             throw new NullPointerException();
         }

         if (base != null) {
             return Object.class;
         }

         return null;
     }

     protected final static class BeanProperties {
         private final Map<String, BeanProperty> properties;

         private final Class<?> type;

         public BeanProperties(Class<?> type) throws ELException {
             this.type = type;
             this.properties = new HashMap<String, BeanProperty>();
             try {
                 BeanInfo info = Introspector.getBeanInfo(this.type);
                 PropertyDescriptor[] pds = info.getPropertyDescriptors();
                 for (PropertyDescriptor pd : pds) {
                     this.properties.put(pd.getName(), new BeanProperty(
                             type, pd));
                 }
             } catch (IntrospectionException ie) {
                 throw new ELException(ie);
             }
         }

         private BeanProperty get(ELContext ctx, String name) {
             BeanProperty property = this.properties.get(name);
             if (property == null) {
                 throw new PropertyNotFoundException(message(ctx,
                         "propertyNotFound",
                         new Object[] { type.getName(), name }));
             }
             return property;
         }

         public BeanProperty getBeanProperty(String name) {
             return get(null, name);
         }

         private Class<?> getType() {
             return type;
         }
     }

     protected final static class BeanProperty {
         private final Class<?> type;

         private final Class<?> owner;

         private final PropertyDescriptor descriptor;

         private Method read;

         private Method write;

         public BeanProperty(Class<?> owner, PropertyDescriptor descriptor) {
             this.owner = owner;
             this.descriptor = descriptor;
             this.type = descriptor.getPropertyType();
         }

         public Class getPropertyType() {
             return this.type;
         }

         public boolean isReadOnly() {
             return this.write == null
                 && (null == (this.write = getMethod(this.owner, descriptor.getWriteMethod())));
         }

         public Method getWriteMethod() {
             return write(null);
         }

         public Method getReadMethod() {
             return this.read(null);
         }

         private Method write(ELContext ctx) {
             if (this.write == null) {
                 this.write = getMethod(this.owner, descriptor.getWriteMethod());
                 if (this.write == null) {
                     throw new PropertyNotFoundException(message(ctx,
                             "propertyNotWritable", new Object[] {
                                     type.getName(), descriptor.getName() }));
                 }
             }
             return this.write;
         }

         private Method read(ELContext ctx) {
             if (this.read == null) {
                 this.read = getMethod(this.owner, descriptor.getReadMethod());
                 if (this.read == null) {
                     throw new PropertyNotFoundException(message(ctx,
                             "propertyNotReadable", new Object[] {
                                     type.getName(), descriptor.getName() }));
                 }
             }
             return this.read;
         }
     }

     private BeanProperty property(ELContext ctx, Object base,
             Object property) {
         Class<?> type = base.getClass();
         String prop = property.toString();

         BeanProperties props = this.cache.get(type.getName());
         if (props == null || type != props.getType()) {
             props = new BeanProperties(type);
             this.cache.put(type.getName(), props);
         }

         return props.get(ctx, prop);
     }

     private static Method getMethod(Class type, Method m) {
         if (m == null || Modifier.isPublic(type.getModifiers())) {
             return m;
         }
         Class[] inf = type.getInterfaces();
         Method mp;
         for (Class anInf : inf) {
             try {
                 mp = anInf.getMethod(m.getName(), m.getParameterTypes());
                 mp = getMethod(mp.getDeclaringClass(), mp);
                 if (mp != null) {
                     return mp;
                 }
             } catch (NoSuchMethodException e) {
                 //continue
             }
         }
         Class sup = type.getSuperclass();
         if (sup != null) {
             try {
                 mp = sup.getMethod(m.getName(), m.getParameterTypes());
                 mp = getMethod(mp.getDeclaringClass(), mp);
                 if (mp != null) {
                     return mp;
                 }
             } catch (NoSuchMethodException e) {
                 //continue
             }
         }
         return null;
     }

     private final static class ConcurrentCache<K,V> {

         private final int size;
         private final Map<K,V> eden;
         private final Map<K,V> longterm;

         public ConcurrentCache(int size) {
             this.size = size;
             this.eden = new ConcurrentHashMap<K,V>(size);
             this.longterm = new WeakHashMap<K,V>(size);
         }

         public V get(K key) {
             V value = this.eden.get(key);
             if (value == null) {
                 value = this.longterm.get(key);
                 if (value != null) {
                     this.eden.put(key, value);
                 }
             }
             return value;
         }

         public void put(K key, V value) {
             if (this.eden.size() >= this.size) {
                 this.longterm.putAll(this.eden);
                 this.eden.clear();
             }
             this.eden.put(key, value);
         }

     }

     public Object invoke(ELContext context, Object base, Object method, Class<?>[] paramTypes, Object[] params) {
         if (context == null) {
             throw new NullPointerException("ELContext could not be nulll");
         }
         // Why static invocation is not supported
         if (base == null || method == null) {
             return null;
         }

         String methodName = ELUtils.coerceToString(method);
         if (methodName.length() == 0) {
             throw new MethodNotFoundException("The parameter method could not be zero-length");
         }
         Class<?> targetClass = base.getClass();
         if (methodName.equals("<init>") || methodName.equals("<cinit>")) {
             throw new MethodNotFoundException(method + " is not found in target class " + targetClass.getName());
         }

         if (params == null) {
             params = new Object[0];
         }

         Method targetMethod = null;
         if (paramTypes == null) {
             int paramsNumber = params.length;
             Method[] methods = targetClass.getMethods();
             for (Method m : methods) {
                 if (m.getName().equals(methodName) && m.getParameterTypes().length == paramsNumber) {
                     targetMethod = m;
                     break;
                 }
             }
             if (targetMethod == null) {
                 for (Method m : methods) {
                     if (m.getName().equals(methodName) && m.isVarArgs() && paramsNumber >= (m.getParameterTypes().length - 1)) {
                         targetMethod = m;
                         break;
                     }
                 }
             }
         } else {
             try {
                 targetMethod = targetClass.getMethod(methodName, paramTypes);
             } catch (SecurityException e) {
                 throw new ELException(e);
             } catch (NoSuchMethodException e) {
                 throw new MethodNotFoundException(e);
             }
         }
         if (targetMethod == null) {
             throw new MethodNotFoundException(method + " is not found in target class " + targetClass.getName());
         }
         if (paramTypes == null) {
             paramTypes = targetMethod.getParameterTypes();
         }
         //Initial check whether the types and parameter values length
         if (targetMethod.isVarArgs()) {
             if (paramTypes.length - 1 > params.length) {
                 throw new IllegalArgumentException("Inconsistent number between argument types and values");
             }
         } else if (paramTypes.length != params.length) {
             throw new IllegalArgumentException("Inconsistent number between argument types and values");
         }
         try {
             Object[] finalParamValues = new Object[paramTypes.length];
             //Only do the parameter conversion while the method is not a non-parameter one
             if (paramTypes.length > 0) {
                 ExpressionFactory expressionFactory = null;
                 if (ELUtils.isCachedExpressionFactoryEnabled()) {
                     expressionFactory = ELUtils.getCachedExpressionFactory();
                 }
                 if (expressionFactory == null) {
                     expressionFactory = ExpressionFactory.newInstance();
                 }

                 int iCurrentIndex = 0;
                 for (int iLoopSize = paramTypes.length - 1; iCurrentIndex < iLoopSize; iCurrentIndex++) {
                     finalParamValues[iCurrentIndex] = expressionFactory.coerceToType(params[iCurrentIndex], paramTypes[iCurrentIndex]);
                 }
                 /**
                  * Not sure it is over-designed. Do not find detailed description about how the parameter values are passed if the method is of variable arguments.
                  * It might be an array directly passed or each parameter value passed one by one.
                  */
                 if (targetMethod.isVarArgs()) {
                     // varArgsClassType should be an array type
                     Class<?> varArgsClassType = paramTypes[iCurrentIndex];
                     // 1. If there is no parameter value left for the variable argument, create a zero-length array
                     // 2. If there is only one parameter value left for the variable argument, and it has the same array type with the varArgsClass, pass in directly
                     // 3. Else, create an array of varArgsClass type, and add all the left coerced parameter values
                     if (iCurrentIndex == params.length) {
                         finalParamValues[iCurrentIndex] = Array.newInstance(varArgsClassType.getComponentType(), 0);
                     } else if (iCurrentIndex == params.length - 1 && varArgsClassType == params[iCurrentIndex].getClass()
                             && varArgsClassType.getClassLoader() == params[iCurrentIndex].getClass().getClassLoader()) {
                         finalParamValues[iCurrentIndex] = params[iCurrentIndex];
                     } else {
                         Object targetArray = Array.newInstance(varArgsClassType.getComponentType(), params.length - iCurrentIndex);
                         Class<?> componentClassType = varArgsClassType.getComponentType();
                         for (int i = 0, iLoopSize = params.length - iCurrentIndex; i < iLoopSize; i++) {
                             Array.set(targetArray, i, expressionFactory.coerceToType(params[iCurrentIndex + i], componentClassType));
                         }
                         finalParamValues[iCurrentIndex] = targetArray;
                     }
                 } else {
                     finalParamValues[iCurrentIndex] = expressionFactory.coerceToType(params[iCurrentIndex], paramTypes[iCurrentIndex]);
                 }
             }
             Object retValue = targetMethod.invoke(base, finalParamValues);
             context.setPropertyResolved(true);
             return retValue;
         }  catch (IllegalAccessException e) {
             throw new ELException(e);
         } catch (InvocationTargetException e) {
             throw new ELException(e.getCause());
         }
     }
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package javax.el;

	import java.beans.BeanInfo;
	import java.beans.FeatureDescriptor;
	import java.beans.IntrospectionException;
	import java.beans.Introspector;
	import java.beans.PropertyDescriptor;
	import java.lang.reflect.Array;
	import java.lang.reflect.InvocationTargetException;
	import java.lang.reflect.Method;
	import java.lang.reflect.Modifier;
	import java.util.Arrays;
	import java.util.HashMap;
	import java.util.Iterator;
	import java.util.Map;
	import java.util.WeakHashMap;
	import java.util.concurrent.ConcurrentHashMap;


	public class BeanELResolver extends ELResolver {

	private final boolean readOnly;

	private final ConcurrentCache<String, BeanProperties> cache = new ConcurrentCache<String, BeanProperties>(
	1000);

	public BeanELResolver() {
	this.readOnly = false;
	}

	public BeanELResolver(boolean readOnly) {
	this.readOnly = readOnly;
	}

	public Object getValue(ELContext context, Object base, Object property)
	throws NullPointerException, PropertyNotFoundException, ELException {
	if (context == null) {
	throw new NullPointerException();
	}
	if (base == null \|\| property == null) {
	return null;
	}

	context.setPropertyResolved(true);
	Method m = this.property(context, base, property).read(context);
	try {
	return m.invoke(base, (Object[]) null);
	} catch (IllegalAccessException e) {
	throw new ELException(e);
	} catch (InvocationTargetException e) {
	throw new ELException(message(context, "propertyReadError",
	new Object[] { base.getClass().getName(),
	property.toString() }), e.getCause());
	} catch (Exception e) {
	throw new ELException(e);
	}
	}

	public Class<?> getType(ELContext context, Object base, Object property)
	throws NullPointerException, PropertyNotFoundException, ELException {
	if (context == null) {
	throw new NullPointerException();
	}
	if (base == null \|\| property == null) {
	return null;
	}

	context.setPropertyResolved(true);
	return this.property(context, base, property).getPropertyType();
	}

	public void setValue(ELContext context, Object base, Object property,
	Object value) throws NullPointerException,
	PropertyNotFoundException, PropertyNotWritableException,
	ELException {
	if (context == null) {
	throw new NullPointerException();
	}
	if (base == null \|\| property == null) {
	return;
	}

	context.setPropertyResolved(true);

	if (this.readOnly) {
	throw new PropertyNotWritableException(message(context,
	"resolverNotWriteable", new Object[] { base.getClass()
	.getName() }));
	}

	Method m = this.property(context, base, property).write(context);
	try {
	m.invoke(base, value);
	} catch (IllegalAccessException e) {
	throw new ELException(e);
	} catch (InvocationTargetException e) {
	throw new ELException(message(context, "propertyWriteError",
	new Object[] { base.getClass().getName(),
	property.toString() }), e.getCause());
	} catch (Exception e) {
	throw new ELException(e);
	}
	}

	public boolean isReadOnly(ELContext context, Object base, Object property)
	throws NullPointerException, PropertyNotFoundException, ELException {
	if (context == null) {
	throw new NullPointerException();
	}
	if (base == null \|\| property == null) {
	return false;
	}

	context.setPropertyResolved(true);
	return this.readOnly
	\|\| this.property(context, base, property).isReadOnly();
	}

	public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
	if (context == null) {
	throw new NullPointerException();
	}

	if (base == null) {
	return null;
	}

	try {
	BeanInfo info = Introspector.getBeanInfo(base.getClass());
	PropertyDescriptor[] pds = info.getPropertyDescriptors();
	for (PropertyDescriptor pd : pds) {
	pd.setValue(RESOLVABLE_AT_DESIGN_TIME, Boolean.TRUE);
	pd.setValue(TYPE, pd.getPropertyType());
	}
	return Arrays.asList((FeatureDescriptor[]) pds).iterator();
	} catch (IntrospectionException e) {
	//
	}

	return null;
	}

	public Class<?> getCommonPropertyType(ELContext context, Object base) {
	if (context == null) {
	throw new NullPointerException();
	}

	if (base != null) {
	return Object.class;
	}

	return null;
	}

	protected final static class BeanProperties {
	private final Map<String, BeanProperty> properties;

	private final Class<?> type;

	public BeanProperties(Class<?> type) throws ELException {
	this.type = type;
	this.properties = new HashMap<String, BeanProperty>();
	try {
	BeanInfo info = Introspector.getBeanInfo(this.type);
	PropertyDescriptor[] pds = info.getPropertyDescriptors();
	for (PropertyDescriptor pd : pds) {
	this.properties.put(pd.getName(), new BeanProperty(
	type, pd));
	}
	} catch (IntrospectionException ie) {
	throw new ELException(ie);
	}
	}

	private BeanProperty get(ELContext ctx, String name) {
	BeanProperty property = this.properties.get(name);
	if (property == null) {
	throw new PropertyNotFoundException(message(ctx,
	"propertyNotFound",
	new Object[] { type.getName(), name }));
	}
	return property;
	}

	public BeanProperty getBeanProperty(String name) {
	return get(null, name);
	}

	private Class<?> getType() {
	return type;
	}
	}

	protected final static class BeanProperty {
	private final Class<?> type;

	private final Class<?> owner;

	private final PropertyDescriptor descriptor;

	private Method read;

	private Method write;

	public BeanProperty(Class<?> owner, PropertyDescriptor descriptor) {
	this.owner = owner;
	this.descriptor = descriptor;
	this.type = descriptor.getPropertyType();
	}

	public Class getPropertyType() {
	return this.type;
	}

	public boolean isReadOnly() {
	return this.write == null
	&& (null == (this.write = getMethod(this.owner, descriptor.getWriteMethod())));
	}

	public Method getWriteMethod() {
	return write(null);
	}

	public Method getReadMethod() {
	return this.read(null);
	}

	private Method write(ELContext ctx) {
	if (this.write == null) {
	this.write = getMethod(this.owner, descriptor.getWriteMethod());
	if (this.write == null) {
	throw new PropertyNotFoundException(message(ctx,
	"propertyNotWritable", new Object[] {
	type.getName(), descriptor.getName() }));
	}
	}
	return this.write;
	}

	private Method read(ELContext ctx) {
	if (this.read == null) {
	this.read = getMethod(this.owner, descriptor.getReadMethod());
	if (this.read == null) {
	throw new PropertyNotFoundException(message(ctx,
	"propertyNotReadable", new Object[] {
	type.getName(), descriptor.getName() }));
	}
	}
	return this.read;
	}
	}

	private BeanProperty property(ELContext ctx, Object base,
	Object property) {
	Class<?> type = base.getClass();
	String prop = property.toString();

	BeanProperties props = this.cache.get(type.getName());
	if (props == null \|\| type != props.getType()) {
	props = new BeanProperties(type);
	this.cache.put(type.getName(), props);
	}

	return props.get(ctx, prop);
	}

	private static Method getMethod(Class type, Method m) {
	if (m == null \|\| Modifier.isPublic(type.getModifiers())) {
	return m;
	}
	Class[] inf = type.getInterfaces();
	Method mp;
	for (Class anInf : inf) {
	try {
	mp = anInf.getMethod(m.getName(), m.getParameterTypes());
	mp = getMethod(mp.getDeclaringClass(), mp);
	if (mp != null) {
	return mp;
	}
	} catch (NoSuchMethodException e) {
	//continue
	}
	}
	Class sup = type.getSuperclass();
	if (sup != null) {
	try {
	mp = sup.getMethod(m.getName(), m.getParameterTypes());
	mp = getMethod(mp.getDeclaringClass(), mp);
	if (mp != null) {
	return mp;
	}
	} catch (NoSuchMethodException e) {
	//continue
	}
	}
	return null;
	}

	private final static class ConcurrentCache<K,V> {

	private final int size;
	private final Map<K,V> eden;
	private final Map<K,V> longterm;

	public ConcurrentCache(int size) {
	this.size = size;
	this.eden = new ConcurrentHashMap<K,V>(size);
	this.longterm = new WeakHashMap<K,V>(size);
	}

	public V get(K key) {
	V value = this.eden.get(key);
	if (value == null) {
	value = this.longterm.get(key);
	if (value != null) {
	this.eden.put(key, value);
	}
	}
	return value;
	}

	public void put(K key, V value) {
	if (this.eden.size() >= this.size) {
	this.longterm.putAll(this.eden);
	this.eden.clear();
	}
	this.eden.put(key, value);
	}

	}

	public Object invoke(ELContext context, Object base, Object method, Class<?>[] paramTypes, Object[] params) {
	if (context == null) {
	throw new NullPointerException("ELContext could not be nulll");
	}
	// Why static invocation is not supported
	if (base == null \|\| method == null) {
	return null;
	}

	String methodName = ELUtils.coerceToString(method);
	if (methodName.length() == 0) {
	throw new MethodNotFoundException("The parameter method could not be zero-length");
	}
	Class<?> targetClass = base.getClass();
	if (methodName.equals("<init>") \|\| methodName.equals("<cinit>")) {
	throw new MethodNotFoundException(method + " is not found in target class " + targetClass.getName());
	}

	if (params == null) {
	params = new Object[0];
	}

	Method targetMethod = null;
	if (paramTypes == null) {
	int paramsNumber = params.length;
	Method[] methods = targetClass.getMethods();
	for (Method m : methods) {
	if (m.getName().equals(methodName) && m.getParameterTypes().length == paramsNumber) {
	targetMethod = m;
	break;
	}
	}
	if (targetMethod == null) {
	for (Method m : methods) {
	if (m.getName().equals(methodName) && m.isVarArgs() && paramsNumber >= (m.getParameterTypes().length - 1)) {
	targetMethod = m;
	break;
	}
	}
	}
	} else {
	try {
	targetMethod = targetClass.getMethod(methodName, paramTypes);
	} catch (SecurityException e) {
	throw new ELException(e);
	} catch (NoSuchMethodException e) {
	throw new MethodNotFoundException(e);
	}
	}
	if (targetMethod == null) {
	throw new MethodNotFoundException(method + " is not found in target class " + targetClass.getName());
	}
	if (paramTypes == null) {
	paramTypes = targetMethod.getParameterTypes();
	}
	//Initial check whether the types and parameter values length
	if (targetMethod.isVarArgs()) {
	if (paramTypes.length - 1 > params.length) {
	throw new IllegalArgumentException("Inconsistent number between argument types and values");
	}
	} else if (paramTypes.length != params.length) {
	throw new IllegalArgumentException("Inconsistent number between argument types and values");
	}
	try {
	Object[] finalParamValues = new Object[paramTypes.length];
	//Only do the parameter conversion while the method is not a non-parameter one
	if (paramTypes.length > 0) {
	ExpressionFactory expressionFactory = null;
	if (ELUtils.isCachedExpressionFactoryEnabled()) {
	expressionFactory = ELUtils.getCachedExpressionFactory();
	}
	if (expressionFactory == null) {
	expressionFactory = ExpressionFactory.newInstance();
	}

	int iCurrentIndex = 0;
	for (int iLoopSize = paramTypes.length - 1; iCurrentIndex < iLoopSize; iCurrentIndex++) {
	finalParamValues[iCurrentIndex] = expressionFactory.coerceToType(params[iCurrentIndex], paramTypes[iCurrentIndex]);
	}
	/**
	* Not sure it is over-designed. Do not find detailed description about how the parameter values are passed if the method is of variable arguments.
	* It might be an array directly passed or each parameter value passed one by one.
	*/
	if (targetMethod.isVarArgs()) {
	// varArgsClassType should be an array type
	Class<?> varArgsClassType = paramTypes[iCurrentIndex];
	// 1. If there is no parameter value left for the variable argument, create a zero-length array
	// 2. If there is only one parameter value left for the variable argument, and it has the same array type with the varArgsClass, pass in directly
	// 3. Else, create an array of varArgsClass type, and add all the left coerced parameter values
	if (iCurrentIndex == params.length) {
	finalParamValues[iCurrentIndex] = Array.newInstance(varArgsClassType.getComponentType(), 0);
	} else if (iCurrentIndex == params.length - 1 && varArgsClassType == params[iCurrentIndex].getClass()
	&& varArgsClassType.getClassLoader() == params[iCurrentIndex].getClass().getClassLoader()) {
	finalParamValues[iCurrentIndex] = params[iCurrentIndex];
	} else {
	Object targetArray = Array.newInstance(varArgsClassType.getComponentType(), params.length - iCurrentIndex);
	Class<?> componentClassType = varArgsClassType.getComponentType();
	for (int i = 0, iLoopSize = params.length - iCurrentIndex; i < iLoopSize; i++) {
	Array.set(targetArray, i, expressionFactory.coerceToType(params[iCurrentIndex + i], componentClassType));
	}
	finalParamValues[iCurrentIndex] = targetArray;
	}
	} else {
	finalParamValues[iCurrentIndex] = expressionFactory.coerceToType(params[iCurrentIndex], paramTypes[iCurrentIndex]);
	}
	}
	Object retValue = targetMethod.invoke(base, finalParamValues);
	context.setPropertyResolved(true);
	return retValue;
	} catch (IllegalAccessException e) {
	throw new ELException(e);
	} catch (InvocationTargetException e) {
	throw new ELException(e.getCause());
	}
	}
	}