While trying to build a library that uses javah, I ran into a classpath issue. Apparently, the classpath is prefixed with the JDK path: please notice the final search path is wrong. How should I do instead?
elmarco@makai:~/src/sasl/java/CyrusSasl (mingw32 *%)$ CLASSPATH=$PWD javah -o javasasl.h -jni -verbose Sasl
error: cannot access Sasl
class file for Sasl not found
javadoc: error - Class Sasl not found.
[ Search Path: /usr/jav开发者_Python百科a/jdk1.6.0_24/jre/lib/resources.jar:/usr/java/jdk1.6.0_24/jre/lib/rt.jar:/usr/java/jdk1.6.0_24/jre/lib/sunrsasign.jar:/usr/java/jdk1.6.0_24/jre/lib/jsse.jar:/usr/java/jdk1.6.0_24/jre/lib/jce.jar:/usr/java/jdk1.6.0_24/jre/lib/charsets.jar:/usr/java/jdk1.6.0_24/jre/lib/modules/jdk.boot.jar:/usr/java/jdk1.6.0_24/jre/classes//home/elmarco/src/sasl/java/CyrusSasl ]
elmarco@makai:~/src/sasl/java/CyrusSasl (mingw32 *%)$ ls Sasl.java
Sasl.java
Thanks for your help!
(this is jdk1.6.0_24 on Fedora 14)
I usually avoid the CLASSPATH
environment variable. This should work (and maybe without a problem):
javah -classpath .;<your-path> -o javasasl.h -jni -verbose Sasl
If don't need nothing but the local path, then you don't have to specify a -classpath
option, .
is the default value.
Note - you have to compile Sasl.java
first. javah
expects a class file. (Getting started)
I think it's simply a bug in how the javah
outputs its actual classpath. What happens is that it has a bunch of places where it searches for built-in classes, and apart from them, it also uses the stuff in $CLASSPATH
. When it prints the actual classpath used, they do something like this (pseudo code, assuming implicitEntries
is a list of builtin classpath entries, and explicitEntries
is a list of the the directories specified in $CLASSPATH
):
print implicitEntries.join(pathSeparator) + explicitEntries.join(pathSeparator)
where it should have been
print implicitEntries.join(pathSeparator) + pathSeparator + explicitEntries.join(pathSeparator)
The following works fine for me:
$ ls
Sasl.class Sasl.java
$ javah -classpath . -o javasasl.h -jni -verbose Sasl [ Search Path: /usr/java/jdk1.6.0/jre/lib/resources.jar:/usr/java/jdk1.6.0/jre/lib/rt.jar:/usr/java/jdk1.6.0/jre/lib/sunrsasign.jar:/usr/java/jdk1.6.0/jre/lib/jsse.jar:/usr/java/jdk1.6.0/jre/lib/jce.jar:/usr/java/jdk1.6.0/jre/lib/charsets.jar:/usr/java/jdk1.6.0/jre/classes/. ]
[Creating file javasasl.h]
[search path for source files: [.]]
[search path for class files: [/usr/java/jdk1.6.0/jre/lib/resources.jar, /usr/java/jdk1.6.0/jre/lib/rt.jar, /usr/java/jdk1.6.0/jre/lib/sunrsasign.jar, /usr/java/jdk1.6.0/jre/lib/jsse.jar, /usr/java/jdk1.6.0/jre/lib/jce.jar, /usr/java/jdk1.6.0/jre/lib/charsets.jar, /usr/java/jdk1.6.0/jre/classes, /usr/java/jdk1.6.0/jre/lib/ext/dnsns.jar, /usr/java/jdk1.6.0/jre/lib/ext/localedata.jar, /usr/java/jdk1.6.0/jre/lib/ext/sunpkcs11.jar, /usr/java/jdk1.6.0/jre/lib/ext/sunjce_provider.jar, .]]
[loading ./Sasl.class]
[loading /usr/java/jdk1.6.0/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Object.class)]
[loading /usr/java/jdk1.6.0/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Throwable.class)]
[loading /usr/java/jdk1.6.0/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Class.class)]
[done in 585 ms]
$ ls
javasasl.h Sasl.class Sasl.java
Now, since the header file generation doesn't seem to work for you... are you sure you have Sasl.class
in the current directory? javah
works with byte code files, not Java source files.
You show here, that the source file is available ...
(mingw32 *%)$ ls Sasl.java
Sasl.java
but missing is the class file (Sasl.class).
error: cannot access Sasl
class file for Sasl not found
Compile it first.
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