14 September 2005 - java_dev (original) (raw)

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September 14th, 2005

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12:04 pm - batigoal - Ant JSP compilation Hello,does anybody tried JSP compilation with Ant jspc task? I had a lot of troubles with this and finally came to the following error:**[jasperc] 2005-09-14 11:51:27 - ERROR-the file '\jsp\GetChannelData.jsp' generated the following general exception: java.util.EmptyStackException [jasperc] java.util.EmptyStackException [jasperc] at java.util.Stack.peek(Stack.java:79) [jasperc] at org.apache.jasper.compiler.ParserController.resolveFileName(ParserController.java:419) [jasperc] at org.apache.jasper.compiler.ParserController.parse(ParserController.java:187) [jasperc] at org.apache.jasper.compiler.Compiler.compile(Compiler.java:210) [jasperc] at org.apache.jasper.JspC.parseFile(JspC.java:385) [jasperc] at org.apache.jasper.JspC.parseFiles(JspC.java:684) [jasperc] at org.apache.jasper.JspC.main(JspC.java:699) [jasperc] java.util.EmptyStackException [jasperc] at java.util.Stack.peek(Stack.java:79) [jasperc] at org.apache.jasper.compiler.ParserController.resolveFileName(ParserController.java:419) [jasperc] at org.apache.jasper.compiler.ParserController.parse(ParserController.java:187) [jasperc] at org.apache.jasper.compiler.Compiler.compile(Compiler.java:210) [jasperc] at org.apache.jasper.JspC.parseFile(JspC.java:385) [jasperc] at org.apache.jasper.JspC.parseFiles(JspC.java:684) [jasperc] at org.apache.jasper.JspC.main(JspC.java:699)**The task text:[target name="compile_JSP_pages" depends="prepare"] [jspc srcdir="${jsp.dir}" destdir="${build.dir}" package="${package.name}" compiler="jasper" uriroot="." verbose="9"] [classpath] [pathelement path="${classpath}"/] [fileset dir="${lib.dir}"] [include name="**/*.jar"/] [/fileset] [/classpath] [include name="**/*.jsp"/] [/jspc] [/target]May be, anybody can give an advice?

| | 12:53 pm - ex_zadoff59 - how to debug JSP Hi all!How to debug JSP?I want to start web server (sun one),and when web browser sends request i want to see the java code in debugger (like Eclipse) and execute line by line..for ex. i have running server writen in c++i can use gdb to "attach to the process", set breakpoint, ........so how to attach Eclipce to JSP in the same way? | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

03:18 pm - shmuelisms - interfaces + instanceof / collection = BAD?? Hello all, while I'm a experienced programmer, I'm pretty new to Java, so I was wondering about this issue I have. Java Practices explains here, why one should avoid the instanceof operator. I fully understand their reasoning, why polymorphism is better. But this makes the hidden assumption that your relevant objects all share a common base class. What if this is not the case??public interface Foobarable { public void foobar(); } ======================================== ... void foobar(List oList) { for (Iterator oIter = oList.iterator(); oIter.hasNext(); ) { Object listItem = oIter.next(); if (listItem instanceof Foobarable) ((Foobarable)listItem).foobar(); } } ... Is this "acceptable" usage, given that the List will contain different types of objects, that do NOT share a common base class. Is there a BETTER more elegant way to do this??EDIT: Fixed class-name typo in final line. Oops.