I'm running into problems compiling a project using
JDK1.3.1 on Debian Linux and I think its because Ant
doesn't properly recognize the Java version. Here's
the error message (and the source code that generated
it is below):
"compile:
[javac] Modern compiler is not available - using
classic compiler
[javac] Compiling 342 source files to
/home/dev/jakarta-jetspeed/bin/classes
BUILD FAILED
/home/dev/jakarta-jetspeed/build/build.xml:175: Cannot
use classic compiler, as it is not available A common
solution is to set the environment variable JAVA_HOME
to your jdk directory."
And BTW, yes I did set JAVA_HOME to no avail.
Okay, so I've traced this back to the Project.java
file and here's where it decides which Java version
you've got. One question I have is why does it do so
in such a round about way -- why not just go with the
java.version property?
"static {
// Determine the Java version by looking at
available classes
// java.lang.StrictMath was introduced in JDK
1.3
// java.lang.ThreadLocal was introduced in JDK
1.2
// java.lang.Void was introduced in JDK 1.1
// Count up version until a
NoClassDefFoundError ends the try
try {
javaVersion = JAVA_1_0;
Class.forName("java.lang.Void");
javaVersion = JAVA_1_1;
Class.forName("java.lang.ThreadLocal");
javaVersion = JAVA_1_2;
Class.forName("java.lang.StrictMath");
javaVersion = JAVA_1_3;
Class.forName("java.lang.CharSequence");
javaVersion = JAVA_1_4;
} catch (ClassNotFoundException cnfe) {
// swallow as we've hit the max class
version that
// we have
}"
Okay, now in CompilerAdapterFactory it uses this
information, but it does yet another wierd check.
Again I'm wondering why not just accept the value of
java.version?
" if ( compilerType.equalsIgnoreCase("modern") ||
compilerType.equalsIgnoreCase("javac1.3") ||
compilerType.equalsIgnoreCase("javac1.4")) {
// does the modern compiler exist?
try {
Class.forName("com.sun.tools.javac.Main");
} catch (ClassNotFoundException cnfe)
{
task.log("Modern compiler is not
available - using "
+ "classic compiler",
Project.MSG_WARN);
return new Javac12();
}
return new Javac13();"
Can someone provide insight as to why these checks are
so convoluted? I imagine there's a logical reason, I
just don't know the history. Does anyone know how I
can overcome this problem?
Will
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