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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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8  *
9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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13  * accompanied this code).
14  *
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23 
24 import java.beans.BeanInfo;
25 import java.beans.Introspector;
26 import java.beans.PropertyDescriptor;
27 import java.lang.reflect.Method;
28 
29 /**
30  * @test
31  * @bug 8196373
32  * @summary Introspector should work with overridden generic getter method
33  */
34 public final class OverriddenGenericGetter {
35 
36     static class Parent<T> {
37         private T value;
getValue()38         public T getValue() {return value;}
setValue(T value)39         public final void setValue(T value) {this.value = value;}
40     }
41 
42     static class ChildO extends Parent<Object> {
ChildO()43         public ChildO() {}
44         @Override
getValue()45         public Object getValue() {return super.getValue();}
46     }
47 
48     static class ChildA extends Parent<ArithmeticException> {
ChildA()49         public ChildA() {}
50         @Override
getValue()51         public ArithmeticException getValue() {return super.getValue();}
52     }
53 
54     static class ChildS extends Parent<String> {
ChildS()55         public ChildS() {}
56         @Override
getValue()57         public String getValue() {return super.getValue();}
58     }
59 
main(String[] args)60     public static void main(String[] args) throws Exception {
61         testBehaviour(ChildA.class);
62         testBehaviour(ChildO.class);
63         testBehaviour(ChildS.class);
64         test(ChildA.class, ArithmeticException.class);
65         test(ChildO.class, Object.class);
66         test(ChildS.class, String.class);
67     }
68 
testBehaviour(Class<?> beanClass)69     private static void testBehaviour(Class<?> beanClass) throws Exception {
70         BeanInfo beanInfo = Introspector.getBeanInfo(beanClass, Object.class);
71         PropertyDescriptor pd = beanInfo.getPropertyDescriptors()[0];
72         Object bean = beanClass.getConstructor().newInstance();
73         Method readMethod = pd.getReadMethod();
74         Method writeMethod = pd.getWriteMethod();
75 
76         // check roundtrip for default null values
77         writeMethod.invoke(bean,readMethod.invoke(bean));
78         writeMethod.invoke(bean,readMethod.invoke(bean));
79 
80         // set property to non-default value
81         // check roundtrip for non-default values
82         Object param = pd.getPropertyType().getConstructor().newInstance();
83         writeMethod.invoke(bean, param);
84         writeMethod.invoke(bean, readMethod.invoke(bean));
85         writeMethod.invoke(bean, readMethod.invoke(bean));
86     }
87 
test(Class<?> beanClass, Class<?> type)88     private static void test(Class<?> beanClass, Class<?> type) throws Exception {
89         BeanInfo beanInfo = Introspector.getBeanInfo(beanClass, Object.class);
90         PropertyDescriptor[] pds = beanInfo.getPropertyDescriptors();
91         if (pds.length != 1) {
92             throw new RuntimeException("Wrong number of properties");
93         }
94         PropertyDescriptor pd = pds[0];
95         String name = pd.getName();
96         if (!name.equals("value")) {
97             throw new RuntimeException("Wrong name: " + name);
98         }
99 
100         Class<?> propertyType = pd.getPropertyType();
101         if (propertyType != type) {
102             throw new RuntimeException("Wrong property type: " + propertyType);
103         }
104         Method readMethod = pd.getReadMethod();
105         if (readMethod == null) {
106             throw new RuntimeException("Read method is null");
107         }
108         Class<?> returnType = readMethod.getReturnType();
109         if (returnType != type) {
110             throw new RuntimeException("Wrong return type; " + returnType);
111         }
112         Method writeMethod = pd.getWriteMethod();
113         if (writeMethod == null) {
114             throw new RuntimeException("Write method is null");
115         }
116         Class<?>[] parameterTypes = writeMethod.getParameterTypes();
117         if (parameterTypes.length != 1) {
118             throw new RuntimeException("Wrong parameters " + parameterTypes);
119         }
120         if (parameterTypes[0] != Object.class) {
121             throw new RuntimeException("Wrong type: " + parameterTypes[0]);
122         }
123     }
124 }
125