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8271003: hs_err improvement: handle CLASSPATH env setting longer than O_BUFLEN #4947

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@@ -989,7 +989,8 @@ void os::print_environment_variables(outputStream* st, const char** env_list) {
if (envvar != NULL) {
st->print("%s", env_list[i]);
st->print_cr("%s", envvar);
st->print("%s", envvar);
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@dholmes-ora dholmes-ora Aug 3, 2021

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I suggest adding a comment like:
// Use separate cr() printing to avoid unnecessary buffer operations that might cause truncation

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@calvinccheung calvinccheung Aug 3, 2021

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Thanks for taking another look.
I've added the comment.

@@ -0,0 +1,83 @@
* Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
* 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 if you need additional information or have any
* questions.

* @test
* @bug 8271003
* @summary CLASSPATH env variable setting should not be truncated in a hs err log.
* @library /test/lib
* @run driver ClassPathEnvVar
import java.util.Map;

import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;

public class ClassPathEnvVar {
private static final String pathSep = File.pathSeparator;
private static final String sep = File.separator;
private static final String classPathEnv = "CLASSPATH";
private static final String endPath = "end-path";

public static void main(String[] args) throws Exception {
OutputAnalyzer output = runCrasher().shouldContain("CreateCoredumpOnCrash turned off, no core file dumped")


private static OutputAnalyzer runCrasher() throws Exception {
ProcessBuilder pb =

// Obtain the CLASSPATH setting and expand it to more than 2000 chars.
Map<String, String> envMap = pb.environment();
String cp = envMap.get(classPathEnv);
if (cp == null) {
cp = "this" + sep + "is" + sep + "dummy" + sep + "path";
while (cp.length() < 2000) {
cp += pathSep + cp;
cp += pathSep + endPath;
envMap.put(classPathEnv, cp);

return new OutputAnalyzer(pb.start());

private static void checkErrorLog(OutputAnalyzer output) throws Exception {
String classPathLine = output.firstMatch("CLASSPATH=.*");

if (classPathLine == null) {
throw new RuntimeException("CLASSPATH setting not found in hs err log.");

// Check if the CLASSPATH line has been truncated.
if (!classPathLine.endsWith(endPath)) {
throw new RuntimeException("CLASSPATH was truncated in the hs err log.");