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Subject: Re: bug#75440: dejagnu does not like java.io.Console of OpenJDK >= 22
To: Chris Nospam <chris21k@HIDDEN>, 75440 <at> debbugs.gnu.org
References: <trinity-883ac4d3-67e0-4d8c-b926-1fcc387c6cf0-1736354694938@trinity-msg-rest-gmx-gmx-live-bbc95d94c-jjgc7>
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On 1/8/25 10:44, Chris Nospam via Bug-dejagnu via wrote:
> Dear maintainers,
>
> starting with OpenJDK Java 22 java programs using java.io.Console cannot be testet with dejagnu any more. With JDK 21 it works like a charm.
This is a JVM bug or misfeature. We have recently had similar problems
with MinGWGCC tested under Wine. In that case, it was a consequence of
Wine's new support for Windows quasi-ptys.
> I belive it has to do with excape sequences that are not filtered out correctly or similar. I am using dejagnu 1.6.3-1, debain package under Ubuntu 24.04.
DejaGnu does not and cannot filter escape sequences. Expect matches the
patterns it is given. You can write patterns in your testsuite that
accommodate or even verify escape sequences from the program under test.
> For an easy reproduction of the bug I have attached a simple example simple.zip. Just unpack it and execute exectest.sh. Be sure to update JAVA_HOME in this script to a jdk 22 or 23 installation.
>
> In testsuite/simple.log some escape sequences are shown were no one are expected:
> ^[[?1h^[=^[[?2004hhello
> ^[[?1l^[>^[[?1000l^[[?2004lhello
The JVM IO facilities are inserting escape sequenceswithout your program
calling for them. This is a JVM bug or misfeature that Expect (on which
DejaGnu is built) exposes.
> The attached simple echo example works after simply commenting the lines 13-14 (using Console) and uncommenting lines 16-17 (using BufferedReader) in testsuite/simple.sh.
> Alternatively it also works by passing -Djdk.console=java.base to the jvm (1st line in exectest.sh), to trigger the old implementation in JDK.
>
> #!/usr/bin/env -S java --source 23
> // #!/usr/local/java/jdk-23.0.1/bin/java --source 23 -Djdk.console=java.base
>
> import java.io.BufferedReader;
> import java.io.IOException;
> import java.io.InputStreamReader;
>
> public class ConsoleTest {
>
> public static void main(String[] args) throws IOException {
> System.out.print("prompt> ");
>
> java.io.Console c = System.console();
> String input = c.readLine();
>
> // BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
> // String input = in.readLine();
>
> System.out.println(input);
> System.out.println("prompt> ");
> }
>
> }
First, think about what your program actually does compared to what your
testsuite code expects it to do. Examine the message produced at the
end of the test run in simple.log. In fact, that message is produced
*after* echo.exp has completed. Where does that message come from?
(You will benefit far more from the lesson if you find it for yourself
than if I tell you. There is only one place in your testsuite that can
emit that message.)
Second, the inability to send text to the program under test is not a
failure: it is an error and probably an UNRESOLVED test. A block that
is executed as a result of catching a Tcl error probably should be
invoking "error" or possibly "unresolved", not "fail" or even "pass"
(unless you are testing an error condition).
Third, Tcl interpolates backslash escapes in double-quoted strings. You
will need to double (some of) the backslashes and/or review re_syntax(n)
for Tcl regexp syntax.
Fourth, think about simple_test could actually fail. That depends on
what you are trying to do, but any "pass" should have a corresponding
"fail" somewhere.
(Most of the above refers to Expect code in your
testsuite/config/default.exp file.)
> It has something to do with the change of the Java default Console provider to JLine in Java 22.
> https://bugs.openjdk.org/browse/JDK-8309141is is not special with DejaGnu; we have recently had similar issues with
> Wine, encountered while testing mingw32 builds on *nix hosts
> However, as Java Console works everywhere else (windows/linux console/bash/EclipseIDE internal "console"/IntelliJ internal "console") as far I can see, it seems to be something special with dejagnu.
No, the problem is with the JVM and/or your programs and scripts. It
appears to work everywhere else because those escape sequences either
perform terminal control functions or are ignored. You can write
regexps that will optionally match and discard the escape sequences.
Expect exposes this issue because it is strict about matching exactly
what you tell it to match.
-- Jacob
--------------OEXIPA2If4is5aXu9WAOVcSY
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<body>
<div class="moz-cite-prefix">On 1/8/25 10:44, Chris Nospam via
Bug-dejagnu via wrote:<br>
</div>
<blockquote type="cite"
cite="mid:trinity-883ac4d3-67e0-4d8c-b926-1fcc387c6cf0-1736354694938@trinity-msg-rest-gmx-gmx-live-bbc95d94c-jjgc7">
<pre wrap="" class="moz-quote-pre">Dear maintainers,
starting with OpenJDK Java 22 java programs using java.io.Console cannot be testet with dejagnu any more. With JDK 21 it works like a charm.</pre>
</blockquote>
<p>This is a JVM bug or misfeature. We have recently had similar
problems with MinGW<span style="white-space: pre-wrap"> GCC tested under Wine. In that case, it was a consequence of Wine's new support for Windows quasi-ptys.
</span></p>
<blockquote type="cite"
cite="mid:trinity-883ac4d3-67e0-4d8c-b926-1fcc387c6cf0-1736354694938@trinity-msg-rest-gmx-gmx-live-bbc95d94c-jjgc7">
<pre wrap="" class="moz-quote-pre">I belive it has to do with excape sequences that are not filtered out correctly or similar. I am using dejagnu 1.6.3-1, debain package under Ubuntu 24.04.</pre>
</blockquote>
<p>DejaGnu does not and cannot filter escape sequences. Expect
matches the patterns it is given. You can write patterns in your
testsuite that accommodate or even verify escape sequences <span
style="white-space: pre-wrap">from the program under test.
</span></p>
<blockquote type="cite"
cite="mid:trinity-883ac4d3-67e0-4d8c-b926-1fcc387c6cf0-1736354694938@trinity-msg-rest-gmx-gmx-live-bbc95d94c-jjgc7">
<pre wrap="" class="moz-quote-pre">For an easy reproduction of the bug I have attached a simple example simple.zip. Just unpack it and execute exectest.sh. Be sure to update JAVA_HOME in this script to a jdk 22 or 23 installation.
In testsuite/simple.log some escape sequences are shown were no one are expected:
^[[?1h^[=^[[?2004hhello
^[[?1l^[>^[[?1000l^[[?2004lhello</pre>
</blockquote>
<p>The JVM IO facilities are inserting escape sequences<span
style="white-space: pre-wrap"> without your program calling for them. This is a JVM bug or misfeature that Expect (on which DejaGnu is built) exposes.
</span></p>
<blockquote type="cite"
cite="mid:trinity-883ac4d3-67e0-4d8c-b926-1fcc387c6cf0-1736354694938@trinity-msg-rest-gmx-gmx-live-bbc95d94c-jjgc7">
<pre wrap="" class="moz-quote-pre">The attached simple echo example works after simply commenting the lines 13-14 (using Console) and uncommenting lines 16-17 (using BufferedReader) in testsuite/simple.sh.
Alternatively it also works by passing -Djdk.console=java.base to the jvm (1st line in exectest.sh), to trigger the old implementation in JDK.
#!/usr/bin/env -S java --source 23
// #!/usr/local/java/jdk-23.0.1/bin/java --source 23 -Djdk.console=java.base
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class ConsoleTest {
public static void main(String[] args) throws IOException {
System.out.print("prompt> ");
java.io.Console c = System.console();
String input = c.readLine();
// BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
// String input = in.readLine();
System.out.println(input);
System.out.println("prompt> ");
}
}
</pre>
</blockquote>
<p>First, think about what your program actually does compared to
what your testsuite code expects it to do. Examine the message
produced at the end of the test run in simple.log. In fact, that
message is produced *after* echo.exp has completed. Where does
that message come from?</p>
<p>(You will benefit far more from the lesson if you find it for
yourself than if I tell you. There is only one place in your
testsuite that can emit that message.)<br>
</p>
<p>Second, the inability to send text to the program under test is
not a failure: it is an error and probably an UNRESOLVED test. A
block that is executed as a result of catching a Tcl error
probably should be invoking "error" or possibly "unresolved", not
"fail" or even "pass" (unless you are testing an error condition).</p>
<p>Third, Tcl interpolates backslash escapes in double-quoted
strings. You will need to double (some of) the backslashes and/or
review re_syntax(n) for Tcl regexp syntax.</p>
<p>Fourth, think about simple_test could actually fail. That
depends on what you are trying to do, but any "pass" should have a
corresponding "fail" somewhere.</p>
<p>(Most of the above refers to Expect code in your
testsuite/config/default.exp file.)<br>
</p>
<blockquote type="cite"
cite="mid:trinity-883ac4d3-67e0-4d8c-b926-1fcc387c6cf0-1736354694938@trinity-msg-rest-gmx-gmx-live-bbc95d94c-jjgc7">
<pre wrap="" class="moz-quote-pre">It has something to do with the change of the Java default Console provider to JLine in Java 22.
<a class="moz-txt-link-freetext" href="https://bugs.openjdk.org/browse/JDK-8309141is">https://bugs.openjdk.org/browse/JDK-8309141is</a> is not special with DejaGnu; we have recently had similar issues with
Wine, encountered while testing mingw32 builds on *nix hosts
However, as Java Console works everywhere else (windows/linux console/bash/EclipseIDE internal "console"/IntelliJ internal "console") as far I can see, it seems to be something special with dejagnu.</pre>
</blockquote>
<p>No, the problem is with the JVM and/or your programs and
scripts. It appears to work everywhere else because those escape
sequences either perform terminal control functions or are
ignored. You can write regexps that will optionally match and
discard the escape sequences. Expect exposes this issue because
it is strict about matching exactly what you tell it to match.<br>
</p>
<p><br>
</p>
<p>-- Jacob<br>
</p>
<p><br>
</p>
</body>
</html>
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--refeik-260945c3-c1e3-4e45-9036-350984ec99a0
Content-Type: text/plain; charset=UTF-8
Dear maintainers,
starting with OpenJDK Java 22 java programs using java.io.Console cannot be testet with dejagnu any more. With JDK 21 it works like a charm.
I belive it has to do with excape sequences that are not filtered out correctly or similar. I am using dejagnu 1.6.3-1, debain package under Ubuntu 24.04.
For an easy reproduction of the bug I have attached a simple example simple.zip. Just unpack it and execute exectest.sh. Be sure to update JAVA_HOME in this script to a jdk 22 or 23 installation.
In testsuite/simple.log some escape sequences are shown were no one are expected:
^[[?1h^[=^[[?2004hhello
^[[?1l^[>^[[?1000l^[[?2004lhello
The attached simple echo example works after simply commenting the lines 13-14 (using Console) and uncommenting lines 16-17 (using BufferedReader) in testsuite/simple.sh.
Alternatively it also works by passing -Djdk.console=java.base to the jvm (1st line in exectest.sh), to trigger the old implementation in JDK.
#!/usr/bin/env -S java --source 23
// #!/usr/local/java/jdk-23.0.1/bin/java --source 23 -Djdk.console=java.base
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class ConsoleTest {
public static void main(String[] args) throws IOException {
System.out.print("prompt> ");
java.io.Console c = System.console();
String input = c.readLine();
// BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
// String input = in.readLine();
System.out.println(input);
System.out.println("prompt> ");
}
}
It has something to do with the change of the Java default Console provider to JLine in Java 22.
https://bugs.openjdk.org/browse/JDK-8309141
However, as Java Console works everywhere else (windows/linux console/bash/EclipseIDE internal "console"/IntelliJ internal "console") as far I can see, it seems to be something special with dejagnu.
Thanks for dejagnu, maintaining it, and your help,
Chris
--refeik-260945c3-c1e3-4e45-9036-350984ec99a0
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--refeik-260945c3-c1e3-4e45-9036-350984ec99a0--
Chris Nospam <chris21k@HIDDEN>:bug-dejagnu@HIDDEN.
Full text available.bug-dejagnu@HIDDEN:bug#75440; Package dejagnu.
Full text available.
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