“NullPointerException”The number passed in the api is min() and max() is a null pointer.

[Cici-Musse-Lee]

The file path is org.zkoss.lang.Comparables.
In our test case, we pass compare0 and compare1 into the functions whose api is max() and min(). Inside these api, an exception occurs when a null pointer is referenced for comparison

source code：

@SuppressWarnings ("unchecked")
public static final Comparable min (Comparable a,Comparable b){
        return (a.compareTo(b)<0)?a b;
}


@SuppressWarnings("unchecked")
public static final Comparable max (Comparable a,Comparable b){
        return (a.compareTo(b)<0)?b : a;
}

test code：

@Test
public void test _min_5_5() throws NoSuchFieldException, IllegalAccessException{

        java.lang.Comparable<java.lang.object>comparable0=null;
        java.lang.Comparable<java.lang.Object>comparable1=null;
        org.zkoss.lang.Comparables.min(comparable0,comparable1);

}

@Test
public void test _max_1_6() throws NoSuchFieldException,IllegalAccessException{
        java.lang.Comparable<java.lang.Object>comparable0=null;
        java.lang.Comparable<java.lang.Object>comparable1=null;
        org.zkoss.lang.Comparables.max (comparable0,comparable1);

test results：

java.lang.NullPointerException:Cannot invoke "java.lang.Comparable.compareTo(Object)"because "a"is null
at org.zkoss.lang.Comparables.min(Comparables.java:33)
at org.zkoss.lang.Comparables_Test.test_min_1_1(Comparables_Test.java:13)