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From the documentation:
JasperReports provides several ways to extend its functionality. [...] To use these extensions in Jaspersoft Studio, just add the required JARs to the Jaspersoft Studio classpath. The Jaspersoft Studio classpath is composed of static and reloadable paths. Extensions must be set as static paths [...].
Is there any comprehensive guide how to add such an extension to the *static classpath of Jaspersoft Studio*? I already created some different extensions (Query Executer, PDF-Exporter, Generic Components, ...) which work in a small java testing environment using the library directly, but I never figured out how to add those jars to [some static classpath of JR Studio], so that the preview works. Everything I tried results in
net.sf.jasperreports.engine.JRException: Class some.package.with.MyClass not found.
Caused by: java.lang.ClassNotFoundException: some.package.with.MyClass cannot be found by net.sf.jasperreports_6.19.1.final