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I think, "Compression Level" property of "Options|Packaging and Deployment|JAR|JAR Packager" node is not used in JAR Packager module. But it is visible and editable and could be set to invalid values (for example: -1, 1000). JarPackagerOptions class contains other properties also. I think, they should be visible as not editable properties.
what is the reasoning for having them visible to the user? what is the added value? the compression level value is probably really not used, however it can be used from depending modules..
values are checked by a combo that you can choose values from. the property is not used directly in the jarpackager recipe (which uses the value derived from the template) but can be used by depending modules, I cannot remove it. The other properties there are obsolete and are in place only for backward compatibility reasons.
Verified
Resolved for 3.4 or earlier, no new info since then -> closing.