サンプル

public GetDeclaredMethod_Example() {
super();
}

public void setValue( int value ) {
this .value = value;
}

public int getValue() {
return value;
}

private int value;

public static void main(String[] args){
try {
Method method = GetDeclaredMethod_Example.class.getDeclaredMethod( "getValue", new Class[] { Void.class } ); //$NON-NLS-1$
GetDeclaredMethod_Example obj = new GetDeclaredMethod_Example();
method.invoke( obj, new Object[] { new Integer( 1 ) } );
System.out.println( obj.getValue() );
} catch (IllegalAccessException e) {
System.out.println( "Can't access private method 'getValue'" ); //$NON-NLS-1$
} catch (InvocationTargetException e) {
System.out.println( "Problem calling method" ); //$NON-NLS-1$
} catch (NoSuchMethodException e) {
System.out.println( "No method getValue" ); //$NON-NLS-1$
}

}

解決策
getDeclaredMethod() の代わりに、ハードコーディングされたメソッドの名前で直接メソッド呼び出しを使用します。

public GetDeclaredMethod_Solution() {
super();
}

public void setValue( int value ) {
this .value = value;
}

public int getValue() {
return value;
}

private int value;

public static void main(String[] args) {
GetDeclaredMethod_Example obj = new GetDeclaredMethod_Example();
obj.setValue( 1 );
System.out.println( obj.getValue() );
}