Java Programming

I've couldn't find a working sample with Jasper Reports
The sample in the jaspers projects site are not what i've expected to find.
I need somethig like a Hello Report. Or even better a report to a query from a database.
I've tried some guidelines from googling but still have this execptions:

net.sf.jasperreports.engine.JRException: Error compiling report java source files : E:\workspace\JasperReport\Simple_Report_1198053556890_895855.java
at net.sf.jasperreports.engine.design.JRJavacCompiler.compileClasses(JRJavacCompiler.java:93)
at net.sf.jasperreports.engine.design.JRAbstractClassCompiler.compileUnits(JRAbstractClassCompiler.java:67)
at net.sf.jasperreports.engine.design.JRAbstractCompiler.compileReport(JRAbstractCompiler.java:190)
at net.sf.jasperreports.engine.JasperCompileManager.compileReport(JasperCompileManager.java:220)
at net.sf.jasperreports.engine.JasperCompileManager.compileReport(JasperCompileManager.java:153)
at JasperReportsIntro.main(JasperReportsIntro.java:20)
Caused by: java.io.IOException: Cannot run program "javac": CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessBuilder.start(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at net.sf.jasperreports.engine.design.JRJavacCompiler.compileClasses(JRJavacCompiler.java:62)
... 5 more
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.<init>(Unknown Source)
at java.lang.ProcessImpl.start(Unknown Source)
... 9 more


http://www.ensode.net/jasperreports_intro.html