Re: calling Java for ObjC
Re: calling Java for ObjC
- Subject: Re: calling Java for ObjC
- From: Evan Schoenberg <email@hidden>
- Date: Wed, 5 Jan 2005 22:32:04 -0600
Are you sure
testSoap = [NSClassFromString(@"TestWeatherSoap") new];
is actually working? Try NSLog(@"testSoap: %@",testSoap); and see what
it's doing.
(Unsupported major.minor version 48.0)
This is quite likely (based on my experience) because the java class
you're loading requires Java 1.4.x. JavaVM.framework loads Java 1.3.1.
I spent a -long- time trying to figure out how to get it load Java
1.4.x to no avail... if you manage to get around this, -please- post it
to the list.
Hope that helps,
Evan
On Jan 5, 2005, at 8:23 PM, Byron Wright wrote:
I am attempting to instantiate and call Java classes from Objective-C
and I am running into the following error after instantiating a Java
class and when calling it's methods on Panther :
2005-01-05 17:59:37.606 TechDemo[1297] An uncaught exception was raised
2005-01-05 17:59:37.646 TechDemo[1297]
java/lang/UnsupportedClassVersionError: org/w3c/dom/Node (Unsupported
major.minor version 48.0)
Stack Trace:
java.lang.UnsupportedClassVersionError: org/w3c/dom/Node (Unsupported
major.minor version 48.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:488)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:
106)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:243)
at java.net.URLClassLoader.access$100(URLClassLoader.java:51)
at java.net.URLClassLoader$1.run(URLClassLoader.java:190)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:183)
at java.lang.ClassLoader.loadClass(ClassLoader.java:294)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:288)
at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:310)
at TestWeatherSoap.getTemp(TestWeatherSoap.java:22)
at TestWeatherSoap.test(TestWeatherSoap.java:61)
2005-01-05 17:59:37.646 TechDemo[1297] *** Uncaught exception:
<java/lang/UnsupportedClassVersionError> org/w3c/dom/Node (Unsupported
major.minor version 48.0)
The following code generates the error:
- (id) init
{
if(self = [super init])
{
NSString * cp = [NSString
stringWithFormat:@"%@:%@",[NSJavaVirtualMachine
defaultClassPath],@"./soap.jar:./SoapTest.jar"]; //add apache soap and
my custom classes to classpath
NSLog(@"classpath = %@",cp);
jvm = [[NSJavaVirtualMachine alloc] initWithClassPath:cp];
testSoap = [NSClassFromString(@"TestWeatherSoap") new]; //works fine
[self searchFor:@"98125"];
}
return self;
}
- (void) searchFor : (NSString * ) query
{
[testSoap test]; //causes error
}
The resources I have been able to find using google suggest that the
wrong version of the JVM is being instantiated. I found this info here
: http://www.cocoadev.com/index.pl?XcodeObjCJavaBridge
One possible solution and according to Apple's documentation
(http://developer.apple.com/documentation/Java/Conceptual/
Java141Development/index.html ) I should be able to add the following
to the info.plist file. However, this doesn't seem to work. There
doesn't seem to be much documentation on Apple's site about
NSJavaVirtualMachine and by looking at the header file I don't see any
may of specifying this when creating an instance of the JVM.
- Byron
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