1 /*
2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
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
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 import java.io.*;
25 import java.util.*;
26
27 /*
28 * @test
29 * @bug 4202914 4363318 6991528
30 * @summary Basic test of serialization of stack trace information
31 * @author Josh Bloch
32 */
33
34 public class StackTraceSerialization {
35 public static void main(String args[]) throws Exception {
36 testWithSetStackTrace();
37 testWithFillInStackTrace();
38 }
39
40 private static void testWithSetStackTrace() {
41 Throwable t = new Throwable();
42 t.setStackTrace(null); // Immutable and empty stack
43 assertEmptyStackTrace(t);
44
45 t.fillInStackTrace();
46 // Verify fillInStackTrace is now a no-op.
47 assertEmptyStackTrace(t);
48
49 t.setStackTrace(new StackTrace[] {new StackTraceElement("foo", "bar", "baz", -1)});
50 assertEmptyStackTrace(t);
51
52 if (!equal(t, reconstitute(t)))
53 throw new Exception("Unequal Throwables with set stacktrace");
54 }
55
56 private static void assertEmptyStackTrace(Throwable t) {
57 if (t.getStackTrace.length != 0)
58 throw new AssertionError("Nonempty stacktrace.");
59 }
60
61 private static void testWithFillInStackTrace() {
62 Throwable original = null;
63 try {
64 a();
65 } catch(HighLevelException e) {
66 original = e;
67 }
68
69 if (!equal(original, reconstitute(original)))
70 throw new Exception("Unequal Throwables with filled-in stacktrace");
71 }
72
73
74 /**
75 * Serialize the argument and return the deserialized result.
76 */
77 private static Throwable reconstitute(Throwable t) {
78 Throwable result = null;
79 ByteArrayOutputStream bout = new ByteArrayOutputStream();
80 ObjectOutputStream out = new ObjectOutputStream(bout);
81 out.writeObject(t);
82 out.flush();
83 ByteArrayInputStream bin =
84 new ByteArrayInputStream(bout.toByteArray());
85 o ObjectInputStream in = new ObjectInputStream(bin);
86 result = (Throwable) in.readObject();
87 return result;
88 }
89
90 /**
91 * Returns true if e1 and e2 have equal stack traces and their
92 * causes are recursively equal (by the same definition) and their
93 * suppressed exception information is equals. Returns false or
94 * throws NullPointerExeption otherwise.
95 */
96 private static boolean equal(Throwable t1, Throwable t2) {
97 return t1==t2 ||
98 (Arrays.equals(t1.getStackTrace(), t2.getStackTrace()) &&
99 equal(t1.getCause(), t2.getCause()) &&
100 Objects.equals(t1.getSuppressed(), t2.getSuppressed()));
101 }
102
103 static void a() throws HighLevelException {
104 try {
105 b();
106 } catch(MidLevelException e) {
107 throw new HighLevelException(e);
108 }
109 }
110 static void b() throws MidLevelException {
111 c();
112 }
113 static void c() throws MidLevelException {
114 try {
115 d();
116 } catch(LowLevelException e) {
117 throw new MidLevelException(e);
118 }
119 }
120 static void d() throws LowLevelException {
121 e();
122 }
123 static void e() throws LowLevelException {
124 throw new LowLevelException();
125 }
126
127 private static final String OUR_CLASS = StackTraceSerialization.class.getName();
128 private static final String OUR_FILE_NAME = "StackTraceSerialization.java";
129
130 private static void check(StackTraceElement e, String methodName, int n) {
131 if (!e.getClassName().equals(OUR_CLASS))
132 throw new RuntimeException("Class: " + e);
133 if (!e.getMethodName().equals(methodName))
134 throw new RuntimeException("Method name: " + e);
135 if (!e.getFileName().equals(OUR_FILE_NAME))
136 throw new RuntimeException("File name: " + e);
137 if (e.getLineNumber() != n)
138 throw new RuntimeException("Line number: " + e);
139 }
140 }
141
142 class HighLevelException extends Exception {
143 HighLevelException(Throwable cause) { super(cause); }
144 }
145
146 class MidLevelException extends Exception {
147 MidLevelException(Throwable cause) { super(cause); }
148 }
149
150 class LowLevelException extends Exception {
151 }