Examples of java.lang.reflect.Method.invoke()

java.lang.reflect.Method.invoke()
Invokes the underlying method represented by this Method object, on the specified object with the specified parameters. Individual parameters are automatically unwrapped to match primitive formal parameters, and both primitive and reference parameters are subject to method invocation conversions as necessary.
If the underlying method is static, then the specified obj argument is ignored. It may be null.
If the number of formal parameters required by the underlying method is 0, the supplied args array may be of length 0 or null.
If the underlying method is an instance method, it is invoked using dynamic method lookup as documented in The Java Language Specification, Second Edition, section 15.12.4.4; in particular, overriding based on the runtime type of the target object will occur.
If the underlying method is static, the class that declared the method is initialized if it has not already been initialized.
If the method completes normally, the value it returns is returned to the caller of invoke; if the value has a primitive type, it is first appropriately wrapped in an object. However, if the value has the type of an array of a primitive type, the elements of the array are not wrapped in objects; in other words, an array of primitive type is returned. If the underlying method return type is void, the invocation returns null. @param obj the object the underlying method is invoked from @param args the arguments used for the method call @return the result of dispatching the method represented bythis object on obj with parameters args @exception IllegalAccessException if this Method objectenforces Java language access control and the underlying method is inaccessible. @exception IllegalArgumentException if the method is aninstance method and the specified object argument is not an instance of the class or interface declaring the underlying method (or of a subclass or implementor thereof); if the number of actual and formal parameters differ; if an unwrapping conversion for primitive arguments fails; or if, after possible unwrapping, a parameter value cannot be converted to the corresponding formal parameter type by a method invocation conversion. @exception InvocationTargetException if the underlying methodthrows an exception. @exception NullPointerException if the specified object is nulland the method is an instance method. @exception ExceptionInInitializerError if the initializationprovoked by this method fails.

          for (int i = 0; i < theMethods.length; i++) {
            String methodString = theMethods[i].getName();


            if (methodString.equals((set + mName))) {
              Method mth1 = clUI.getMethod((set + mName), theMethods[i].getParameterTypes());
              mth1.invoke(objUIVO, argList);
            }
          }


        }
      } // end of if statement (hm != null)

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    Object dirContext = context.getAttribute("org.apache.catalina.resources");
    Class dirContextClass = dirContext.getClass();


    try {
      Method hostMethod = dirContextClass.getMethod("getHostName", null);
      host = (String) hostMethod.invoke(dirContext, null);
    } catch (Exception e) {
      logger.error("[getHostName] Cannot retrieve hostname.", e);
    }


    // if it is null the above method call failed for some reason.

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      // iterate the parameters array and get the types to build a Class[] to
      // find the method.
      Class[] methodArgType = CVUtility.getClassArray(parameters);
      Method remoteMethod = ejbClass.getMethod(remoteMethodName, methodArgType);
      // it'd be really cool if this actually works consistently.
      result = remoteMethod.invoke(ejb, parameters);
    } catch (Exception e) {
      // Catch all possible exceptions log and rethrow as a generic exception
      // the struts world should handle this somehow or wrap up in a servlet
      // exception
      // and bubble it up.

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      // Get the home object
      Object ejbHome = CVUtility.getHomeObject(remoteClassName, jndiName);
      Class ejbHomeClass = ejbHome.getClass();
      // Call create
      Method homeCreateMethod = ejbHomeClass.getMethod("create", null);
      ejb = homeCreateMethod.invoke(ejbHome, null);
      Class ejbClass = ejb.getClass();
      // set the dataSource
      Class[] setDataSourceArgType = { String.class };
      Method setDataSourceMethod = ejbClass.getMethod("setDataSource", setDataSourceArgType);
      Object[] setDataSourceArg = { dataSource };

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      Class ejbClass = ejb.getClass();
      // set the dataSource
      Class[] setDataSourceArgType = { String.class };
      Method setDataSourceMethod = ejbClass.getMethod("setDataSource", setDataSourceArgType);
      Object[] setDataSourceArg = { dataSource };
      setDataSourceMethod.invoke(ejb, setDataSourceArg);
    } catch (Exception e) {
      throw e;
    }
    return ejb;
  }

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public abstract class BaseSampleBeanFactory implements BeanFactory {


  protected static void setCreatedByFactoryName(Object target, String name) {
    try {
      Method method = target.getClass().getMethod("setCreatedByFactoryName", new Class[] { String.class });
      method.invoke(target, new Object[] { name });
    } catch (Exception e) {
      // this object is only used for unit testing so do a catch all for ease of use
    }
  }
}

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    String applicationClassName = "com.eteks.furniturelibraryeditor.FurnitureLibraryEditor";
    Class<?> applicationClass = java3DClassLoader.loadClass(applicationClassName);
    Method applicationClassMain = 
        applicationClass.getMethod("main", Array.newInstance(String.class, 0).getClass());
    // Call application class main method with reflection
    applicationClassMain.invoke(null, new Object [] {args});
  }
}

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            Method m = methods.get(property);
            try {
                if (m == null)
                    throw new IllegalStateException("No getter found for " + property);


                Object result = m.invoke(object);
                if (result != null) {
                    Writing writing = getWriting(m.getReturnType());
                    if (writing == null)
                        throw new UnsupportedOperationException("No writing found for " + m.getReturnType());

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            if (m == null)
                throw new NullPointerException("Cannot find setter for element:" + element.getName());
            try {
                Class setterType = m.getParameterTypes()[0];
                Object result = getResult(object, setterType, element);
                m.invoke(object, result);
            } catch (Exception ex) {
                throw new RuntimeException("Exception while parsing ("
                        + element.getName() + ") to "
                        + object.getClass().getName() + " " + object, ex);
            }

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                    param = new HashSet((Collection) param);
                } else if (Map.class.isAssignableFrom(getter.getValue().getReturnType())) {
                    param = new HashMap((Map) param);
                }


                setter.invoke(newObj, param);
            } catch (Exception ex) {
                logger.fatal("Cannot set:" + getter.getKey(), ex);
            }
        }
    }

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