PrintServiceLookup in Tomcat 4.0.3 / Centos 5.3
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From: cyber sana on 24 Jun 2010 23:22 Dear Experts, One week ago i ask about this and still cannot find the solution. Problem: In tomcat application, PrintServiceLookup cannot return any existing printer: PrintService[] pservices = PrintServiceLookup.lookupPrintServices(null, null); But when I use this statement in a single .java to run & test independently, it can find all my printer service. I print out java version in tomcat Java home: /root/j2sdk1.4.2_19/jre Java vesion: 1.4.2_19 They are the same as the one I singlely compile .java source. Can anyone give me hint why i cannot detect any printer in Centos tomcat 4.0.3 ? By the way, I build the class file first in windows (using same java version, and can detect printers in windows tomcat) and move the class to centos tomcat. Is it related ? Thanks.
From: John B. Matthews on 25 Jun 2010 00:19
In article <635e01c3-0d13-4439-921a-696ed998084f(a)w12g2000yqj.googlegroups.com>, cyber sana <cybersana(a)gmail.com> wrote: > Problem: > In tomcat application, PrintServiceLookup cannot return any existing > printer: > > PrintService[] pservices = > PrintServiceLookup.lookupPrintServices(null, null); > > But when I use this statement in a single .java to run & test > independently, it can find all my printer service. > > I print out java version in tomcat > Java home: /root/j2sdk1.4.2_19/jre > Java vesion: 1.4.2_19 > > They are the same as the one I singlely compile .java source. > > Can anyone give me hint why i cannot detect any printer in Centos > tomcat 4.0.3 ? > > By the way, I build the class file first in windows (using same java > version, and can detect printers in windows tomcat) and move the > class to centos tomcat. Is it related ? I see that getPrintServices() mentions being "Implemented by a service provider, used by the static methods of this class." Your finding suggests that the PrintServiceLookup class is OS-specific. <http://java.sun.com/j2se/1.4.2/docs/api/javax/print/PrintServiceLookup.html> I'm not sure if it would help, but "Files in the [JAR's] META-INF/services directory are service provider configuration files." <http://java.sun.com/j2se/1.4.2/docs/guide/jar/jar.html#Service%20Provider> -- John B. Matthews trashgod at gmail dot com <http://sites.google.com/site/drjohnbmatthews> |