** Description changed:
[Impact]
-
- openjdk-9 introduced a few api changes that result in runtime errors
- when trying to run the java classes under openjdk 8 (or earlier) even
- when -source/-target are properly set.
+ openjdk-9 introduced a few api changes that result in runtime errors when
trying to run the java classes under openjdk 8 (or earlier) even when
-source/-target are properly set.
The fix is to build such code using the new openjdk-9 flag "--release"
instead of the "-source/-target" pair.
When running Cosmic's jtreg 4.2-b13-1 with agentvm under openjdk-8 it will
fail and output a few lines such as:
stderr: Exception: java.lang.NoSuchMethodError thrown from the
UncaughtExceptionHandler in thread "main"
The java.lang.NoSuchMethodError is actually caused by
"java.lang.NoSuchMethodError:
java.nio.ByteBuffer.flip()Ljava/nio/ByteBuffer" which can be easily
solved by building jtreg with the "--release 7" argument.
+ This affects the openjdk-8 build in Cosmic as the jtreg testsuites are
+ run as part of the build. We use the test results for checking
+ regressions from an update.
[Test Case]
For this test case we need to create an empty TEST.ROOT file and a test class
to satisfy jtreg requirements of a minimum test. jtreg must also be forced to
use openjdk-8.
$ sudo apt install openjdk-8-jdk jtreg
$ touch TEST.ROOT
$ cat > Hello.java << EOF
/*
- * @test
- * @bug 2718282
- * @summary Hello test
- */
+ * @test
+ * @bug 2718282
+ * @summary Hello test
+ */
public class Hello {
- public static void main(String [] args) throws Exception {
- if (true)
- System.out.println("Hello World!");
- else
- throw new Exception("??");
- }
+ public static void main(String [] args) throws Exception {
+ if (true)
+ System.out.println("Hello World!");
+ else
+ throw new Exception("??");
+ }
}
EOF
- $ JT_JAVA=/usr/lib/jvm/java-8-openjdk-amd64/ jtreg -va -agentvm Hello.java
- [2018-11-15 23:42:34,720] Agent[0]: stderr:
+ $ JT_JAVA=/usr/lib/jvm/java-8-openjdk-amd64/ jtreg -va -agentvm Hello.java
+ [2018-11-15 23:42:34,720] Agent[0]: stderr:
[2018-11-15 23:42:34,721] Agent[0]: stderr: Exception:
java.lang.NoSuchMethodError thrown from the UncaughtExceptionHandler in thread
"main"
--------------------------------------------------
TEST: Hello.java
TEST JDK: /usr/lib/jvm/java-8-openjdk-amd64
[snipped]
Test results: error: 1
Report written to /tmp/JTreport/html/report.html
Results written to /tmp/JTwork
Error: Some tests failed or other problems occurred.
-
The expected response from jtreg does not contain the "stderr:" lines as in:
- $ JT_JAVA=/usr/lib/jvm/java-8-openjdk-amd64/ jtreg -va -agentvm Hello.java
+ $ JT_JAVA=/usr/lib/jvm/java-8-openjdk-amd64/ jtreg -va -agentvm Hello.java
--------------------------------------------------
TEST: Hello.java
TEST JDK: /usr/lib/jvm/java-8-openjdk-amd64
[snipped]
Test results: passed: 1
Report written to /tmp/JTreport/html/report.html
Results written to /tmp/JTwork
Alternatively one can also check that openjdk-lts is not affected by the
change, it should output the same before and after the fix:
$ sudo apt install openjdk-11-jdk
- $ JT_JAVA=/usr/lib/jvm/java-11-openjdk-amd64/ jtreg -va -agentvm Hello.java
+ $ JT_JAVA=/usr/lib/jvm/java-11-openjdk-amd64/ jtreg -va -agentvm Hello.java
--------------------------------------------------
TEST: Hello.java
TEST JDK: /usr/lib/jvm/java-11-openjdk-amd64
[snipped]
Test results: passed: 1
Report written to /tmp/JTreport/html/report.html
Results written to /tmp/JTwork
-
[Regression Potential]
- 1. The --release argument is jdk9+ only, if jtreg is ever build with an older
jdk it will FTBFS, so this change should only be backported on releases where
the default-jdk is 9+.
+ 1. The --release argument is jdk9+ only, if jtreg is ever build with an older
jdk it will FTBFS, so this change should only be backported on releases where
the default-jdk is 9+.
2. The --release N argument is equivalent to setting -source N/-target
N/-bootclasspath <N bootclasspath>, which can cause issues if the compiled
classes use APIs that have been removed or are considered internal. The current
jtreg version does not rely on internal classes from jdk 8 (otherwise it would
FTBFS) but if a later version does that it will probably FTBFS - note that this
is very unlikely as it would mean that upstream decided to break building jtreg
with newer jdks.
-
[Other Info]
See https://github.com/apache/felix/pull/114 for a good overview on the
methods that changed on OpenJDK 9 and a better description on the cause. Note
that they propose patching the methods to cast ByteBuffer to Buffer when
calling the affected methods, but this can be easily prevented by using the
--release argument instead.
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https://bugs.launchpad.net/bugs/1803628
Title:
jtreg fails to run under openjdk-8 due to api incompatibility with
openjdk-9 or later
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