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Re: [Jython-dev] new, trouble w/ simple applet NB
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From: <mt...@ho...> - 2001-07-25 05:59:47
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I just realized it is important to mention that I am using netscape 4.72
(is there a better choice on Linux for Java stuff?)
(Sorry for causing too much traffic).
M
On 24 Jul, To: jyt...@li... wrote:
> Hi,
>
> I am teaching a simple introductory course on programming. I am using
> Python and am interested in introducing at the end for interest sake the
> ability to create simple little programs running inside a browser.
>
> I am a bit clueless about Java.
>
> I have CLASSPATH set to:
>
> [mt@galois applet]$ plecho $CLASSPATH
> /home/mt/external/jython-2.1a1/jython.jar
> .
> ./jpywork
> /home/mt/external/jython-2.1a1/Tools/jythonc
> /home/mt/external/jython-2.1a1
> /home/mt/external/jython-2.1a1/Lib
>
> I have the following HelloWorld.py file:
>
> from java.applet import Applet
>
> class HelloWorld(Applet):
> def paint(self, g):
> g.drawString("Hello from Jython!", 20, 30)
>
> Running jythonc -J deprecation HelloWorld.py
> produces a class file with 9 deprecated API warnings.
>
> I have the following html file:
>
> <html>
> <body>
> <center>
> <applet code="HelloWorld.class"
> width = 500
> height = 105>
> </applet>
> </center>
> </body>
> </html>
>
> The environment that netscape has does contain the same CLASSPATH
> variable (this is required right?).
>
> Here is the java console output:
>
> # Applet exception: exception: java.lang.NullPointerException: trying to call makeJavaPackage(Ljava/lang/String;Ljava/lang/Str
> java.lang.NullPointerException: trying to call makeJavaPackage(Ljava/lang/String;Ljava/lang/Str
> at org.python.core.PySystemState.add_package(PySystemState.java:504)
> at org.python.core.Py.initProperties(Py.java:701)
> at org.python.core.Py.initProxy(Py.java:719)
> * at HelloWorld.__initProxy__(HelloWorld.java:192)
> at HelloWorld.<init>(HelloWorld.java:170)
> at netscape.applet.DerivedAppletFrame$LoadAppletEvent.dispatch(DerivedAppletFrame.java:456)
> at java.awt.EventDispatchThread$EventPump.dispatchEvents(EventDispatchThread.java:81)
> at java.awt.EventDispatchThread.run(EventDispatchThread.java:135)
> at netscape.applet.DerivedAppletFrame$AppletEventDispatchThread.run(DerivedAppletFrame.java:911)
>
> What the hell does this mean????
>
> I am using Jython 2.1a1 and JDK (from Sun) 1.3.1
>
> For interest sake here are the warning from jythonc:
>
> Compiling .java to .class...
> Compiling with args: ['/usr/local/jdk1.3.1/bin/javac', '-deprecation', '-classpa
> th', '"/home/mt/external/jython-2.1a1/jython.jar:/home/mt/external/jython-2.1a1/
> jython.jar:.:./jpywork:/home/mt/external/jython-2.1a1/Tools/jythonc:/home/mt/ext
> ernal/jython-2.1a1:/home/mt/external/jython-2.1a1/Lib:./jpywork::/home/mt/extern
> al/jython-2.1a1/Tools/jythonc:/home/mt/external/jython-2.1a1/Demo/applet/.:/home
> /mt/external/jython-2.1a1/Lib"', './jpywork/HelloWorld.java']
> 0 /home/mt/external/jython-2.1a1/org/python/core/PyString.java:649: warning: getBytes(int,int,byte[],int) in java.lang.String has been deprecated
> string.getBytes(0, string.length(), buf, 0);
> ^
> /home/mt/external/jython-2.1a1/org/python/core/PyFile.java:65: warning: getBytes(int,int,byte[],int) in java.lang.String has been deprecated
> s.getBytes(0, s.length(), buf, 0);
> ^
> /home/mt/external/jython-2.1a1/org/python/core/PyFile.java:74: warning: String(byte[],int,int,int) in java.lang.String has been deprecated
> return new String(buf, 0, offset, len);
> ^
> /home/mt/external/jython-2.1a1/org/python/core/PyFile.java:109: warning: String(byte[],int,int,int) in java.lang.String has been deprecated
> return new String(buf, 0, 0, read);
> ^
> /home/mt/external/jython-2.1a1/org/python/core/__builtin__.java:212: warning: java.io.StringBufferInputStream in java.io has been deprecated
> return Py.compile(new java.io.StringBufferInputStream(data+"\n\n"),
> ^
> /home/mt/external/jython-2.1a1/org/python/core/PyArray.java:139: warning: String(byte[],int) in java.lang.String has been deprecated
> return new String((byte[])data, 0);
> ^
> /home/mt/external/jython-2.1a1/org/python/core/parser.java:70: warning: java.io.StringBufferInputStream in java.io has been deprecated
> return parse(new StringBufferInputStream(string), kind, "<string>");
> ^
> /home/mt/external/jython-2.1a1/org/python/core/parser.java:137: warning: java.io.StringBufferInputStream in java.io has been deprecated
> node = parse(new StringBufferInputStream(string), kind, filename);
> ^
> /home/mt/external/jython-2.1a1/org/python/core/parser.java:143: warning: java.io.StringBufferInputStream in java.io has been deprecated
> node = parse(new StringBufferInputStream(string+"\n"),
> ^
> 9 warnings
>
> Anybody have a clue as to what I am doing wrong? I have tried copying
> the HelloWorld.class all sorts of different places. I have tried
> calling the .class file in the html file different names like HelloWorld
> or jpywork/HelloWorld.class jpywork.HelloWorld - pretty much every
> conceivable combo.
>
> This applet is working for me at http://www.jython.org/applets the
> source of the html there is exactly what I have.
>
> I don't know what I am doing wrong.
>
> Thanks for any help.
> Cheers,
> Mark
>
>
>
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> Jyt...@li...
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