#100 Does not work with Tomcat 6

[Anonymous]

Running under Tomcat 6.0.14 , attempt to create a chart produces the following error
(The same chart works fine running under Tomcat 5x)
SEVERE: CewolfServlet: Can't create output stream!

de.laures.cewolf.ChartRenderingException: Can't create output stream!
at de.laures.cewolf.util.Renderer.renderChart(Renderer.java:118)
at de.laures.cewolf.util.Renderer.render(Renderer.java:88)
at ....more