https://bz.apache.org/bugzilla/show_bug.cgi?id=69586
Bug ID: 69586
Summary: Javac argument file generation creates invalid
classpath entry when compiling Java modules and no
classpath is defined.
Product: Ant
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Core
Assignee: notifications@ant.apache.org
Reporter: slacker6...@gmail.com
Target Milestone: ---
Created attachment 39996
--> https://bz.apache.org/bugzilla/attachment.cgi?id=39996&action=edit
Patch for class org.apache.tools.ant.taskdefs.compilers.DefaultCompilerAdapter
Hello,
When using the javac task to compile Java modules with a large number of source
files, Ant creates a temporary file containing javac arguments. In this file,
if no classpath is defined, a "-classpath" option is generated followed by a
blank line, causing the next argument (-g) to be incorrectly interpreted as the
classpath value.
Step to reproduce :
# cd /tmp
# mkdir -p mymodule/{build,lib,src/mymodule/com/foo/bar}
# echo "module mymodule { }" > mymodule/src/mymodule/module-info.java
# for i in {1..100} ; do echo -e "package com.foo.bar;\npublic class Class${i}
{\n}" > mymodule/src/mymodule/com/foo/bar/Class${i}.java ; done
# echo -e "<project basedir=\".\">\n <target name=\"compile\">\n <javac\n
includeAntRuntime=\"off\"\n fork=\"on\"\n
includeDestClasses=\"off\"\n modulepath=\"lib\"\n
modulesourcepath=\"{src/*}\"\n destdir=\"build\"\n
debug=\"off\">\n <compilerarg line=\"-Xlint:path\"/>\n </javac>\n
</target>\n</project>" > mymodule/build.xml
# cd /tmp/mymodule
# ant -d compile
Apache Ant(TM) version 1.10.15 compiled on November 4 2024
Trying the default build file: build.xml
...
Setting project property: ant.auto.tmpdir -> /tmp/ant12471706666314375667
Execute:Java13CommandLauncher: Executing
'/usr/lib64/jvm/java-21-openjdk-21/bin/javac' with arguments:
'--module-source-path'
'/tmp/TEST/CHECK/mymodule/{src/*}'
'@/tmp/ant12471706666314375667/files15467176437172822301'
The ' characters around the executable and arguments are
not part of the command.
[javac] warning: [path] bad path element "-g": no such file or directory
[javac] warning: [path] bad path element "none": no such file or directory
[javac] 2 warnings
BUILD SUCCESSFUL
Total time: 0 seconds
In the example above, the javac's argument file contains the following :
-d
/tmp/mymodule/build
-classpath
-g:none
-Xlint:path
--module-source-path
/tmp/mymodule/{src/*}
--module-path
/tmp/mymodule/lib
In this situation, the .class files contain the default debug informations
(i.e. the line number and source file) instead of containing no debug
information at all.
The following patch fixes this issue (also in attachment) :
--- DefaultCompilerAdapter.java.orig 2025-02-17 11:55:45.167967569 +0100
+++ DefaultCompilerAdapter.java 2025-02-17 17:02:02.373473718 +0100
@@ -304,8 +304,6 @@
cmd.createArgument().setFile(destDir);
}
- cmd.createArgument().setValue("-classpath");
-
// Just add "sourcepath" to classpath (for JDK1.1)
// as well as "bootclasspath" and "extdirs"
if (!assumeJava1_2Plus()) {
@@ -317,9 +315,15 @@
}
cp.append(classpath);
cp.append(sourcepath);
+
+ cmd.createArgument().setValue("-classpath");
cmd.createArgument().setPath(cp);
} else {
- cmd.createArgument().setPath(classpath);
+ if (!classpath.toString().isEmpty()) {
+ cmd.createArgument().setValue("-classpath");
+ cmd.createArgument().setPath(classpath);
+ }
+
// If the buildfile specifies sourcepath="", then don't
// output any sourcepath.
if (sourcepath.size() > 0) {
Hope this helps.
--
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