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/*
* Copyright (c) 2007, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 6312358
* @summary Verify that an NPE is thrown by invoking Locale.getInstance() with
* any argument being null.
* @modules java.base/java.util:open
* @run junit GetInstanceCheck
*/
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Locale;
import java.util.stream.Stream;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;
import static org.junit.jupiter.api.Assertions.fail;
public class GetInstanceCheck {
static Method getInstanceMethod;
static final String NAME = "getInstance";
/**
* Initialize the non-public Locale.getInstance() method.
*/
@BeforeAll
static void initializeMethod() {
try {
// Locale.getInstance is not directly accessible.
getInstanceMethod = Locale.class.getDeclaredMethod(
NAME, String.class, String.class, String.class
);
getInstanceMethod.setAccessible(true);
} catch (java.lang.NoSuchMethodException exc) {
// The test should fail if we can not test the desired method
fail(String.format("Tried to get the method '%s' which was not found," +
" further testing is not possible, failing test", NAME));
}
}
/**
* Exists as sanity check that Locale.getInstance() will not throw
* an NPE if no arguments are null.
*/
@ParameterizedTest
@MethodSource("passingArguments")
public void noNPETest(String language, String country, String variant)
throws IllegalAccessException {
try {
getInstanceMethod.invoke(null, language, country, variant);
} catch (InvocationTargetException exc) {
// Determine underlying exception
Throwable cause = exc.getCause();
if (exc.getCause() instanceof NullPointerException) {
fail(String.format("%s should not be thrown when no args are null", cause));
} else {
fail(String.format("%s unexpectedly thrown, when no exception should be thrown", cause));
}
}
}
/**
* Make sure the Locale.getInstance() method throws an NPE
* if any given argument is null.
*/
@ParameterizedTest
@MethodSource("failingArguments")
public void throwNPETest(String language, String country, String variant)
throws IllegalAccessException {
try {
getInstanceMethod.invoke(null, language, country, variant);
fail("Should NPE with any argument set to null");
} catch (InvocationTargetException exc) {
// Determine underlying exception
Throwable cause = exc.getCause();
if (cause instanceof NullPointerException) {
System.out.println("NPE successfully thrown");
} else {
fail(cause + " is thrown, when NPE should have been thrown");
}
}
}
private static Stream<Arguments> passingArguments() {
return Stream.of(
Arguments.of("null", "GB", ""),
Arguments.of("en", "null", ""),
Arguments.of("en", "GB", "null")
);
}
private static Stream<Arguments> failingArguments() {
return Stream.of(
Arguments.of(null, "GB", ""),
Arguments.of("en", null, ""),
Arguments.of("en", "GB", null)
);
}
}
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