Lazy download and PrintServiceLookup.lookupPrintServices

Question

In my jnlp file all jars are with "lazy" tag, and everything works fine, but when I execute this line of code:
javax.print.PrintService[] result = PrintServiceLookup.lookupPrintServices( null, null );
all of the jar are downloaded.
I've opened the bug request n: 830151 (but this is only an internal ID) 2 months ago, but got no answers yet.
Any ideas or suggestion?
Regards
Alessandro

Answer 1

If you attempt to load a non-existant resource, all
jars will be loaded looking for it.
This can be avoided in JDK 6 using JarIndexing to
specify what jar contains what resources.Never tried JDK 6.
In JDK 5.0_02+, you can also achieve the same thing
using the "part" and "package" attributes.
In previous versions of Java Web Start, neither of
these worked, so accessing a non-existant resources
would always download all lazy jars.
/AndyI use jre1.5.0_08 and my jnlp (for the test case) is:
<package name="testJWS.*" part="main" recursive="false"/>
<jar href="/client/test-jws/starter.jar" part="main" download="lazy"/>
<package name="testJWS1.*" part="test1" recursive="false"/>
<jar href="/client/test-jws/testJWS1.jar" part="test1" download="lazy"/>
<package name="testJWS2.*" part="test2" recursive="false"/>
<jar href="/client/test-jws/testJWS2.jar" part="test2" download="lazy"/>
<package name="testJWS3.*" part="test3" recursive="false"/>
<jar href="/client/test-jws/testJWS3.jar" part="test3" download="lazy"/>
<package name="com.incors.plaf.*" part="alloy" recursive="true"/>
<jar href="/client/test-jws/alloy.jar" part="alloy" download="eager"/>
So, according to what you say, it should work.
My test case is very simple: a main jar which opens a JFrame contained in testJWS1.jar, which opens a form conteined in testJWS2.jar and so on.
Without the PrintServiceLookup, works perfectly, the jars are downloaded only when needed.
With that line of code everything is download at that moment.
How can I say to JWS something that concern resources contained into rt.jar of the JRE (like PrintServiceLookup)?
I've tried to debug this class (I've found the source code, copied in my class, and used mine with some debug message) and saw that the download appens when Java looks for the file javax.print.PrintServiceLookup which is inside rt.jar\META-INF\services
This file exists ... but it seems like JWS looks for it in all the jar of the classpath (including lazy jar), and then inside rt.jar which is the right place.
Any idea how to say to java: look inside rt.jar before my lazy jars?
The problem is that I cannoy say (don't know how) to JWS that a file is inside the META-INF folder of a jar, otherwise I could copy that file inside my first jar and tell to the JNLP to look there.
Thanks
Alessandro