Hi,
The current UIMA Eclipse plugins (runtime, CDE, etc.) use "Imported
Packages" for declaring dependencies instead of "Required Plug-ins". This
declaration is automatically generated by Maven (I think ?) and gives more
fine grained controls on what to depend on.
But, there are some side-effects from this approach which may cause the
problems. The imported packages may wired to the correct packages from the
"wrong" plugins.
Today, while I am testing the new UIMA build candidate 03 with my plugins, I
had this "wrong" wiring situation. The following is what happen:
- One of my plugins has two exported packages named "org.apache.uima.util"
and "org.apache.uima.jcas.tcas" which are the same as the packages exported
by "org.apache.uima.runtime".
- UIMA runtime plugin (org.apache.uima.runtime) exports "
org.apache.uima.util" and "org.apache.uima.jcas.tcas" packages and it also
imports these two packages.
- UIMA CDE plugin uses some classes (e.g., XMLizable) from "
org.apache.uima.util" which is imported by using "Imported Packages"
approach.
- At runtime, Eclipse OSGi has the following wiring:
id State Bundle
0 ACTIVE org.eclipse.osgi_3.3.1.R33x_v20070828
1 ACTIVE org.eclipse.equinox.common_3.3.0.v20070426
2 ACTIVE org.eclipse.update.configurator_3.2.101.R33x_v20070810
3 ACTIVE org.eclipse.core.runtime_3.3.100.v20070530
4 ACTIVE org.apache.uima.desceditor_2.2.2.incubating
5 <<LAZY>> org.apache.uima.editors.dde_2.2.2.incubating
232 <<LAZY>> org.apache.uima.jcas.jcasgenp_2.2.2.incubating
233 <<LAZY>> org.apache.uima.pear_2.2.2.incubating
234 RESOLVED org.apache.uima.runtime_2.2.2.incubating
Fragments=235
235 RESOLVED
org.apache.uima.runtime.fragments.deployeditor_2.2.2.incubating
Master=234
For CDE (bundle#4), "org.apache.uima.util" package is imported from
Bundle#194
org.apache.uima.util;
version="0.0.0"<[EMAIL
PROTECTED]/ws-test/org.apache.uima.runtimetoolkit.container/
[194]>
For UIMA runtime plugin "org.apache.uima.runtime" (Bundle#234), it has the
following resolution:
org.apache.uima.jcas.tcas;
version="0.0.0"<[EMAIL
PROTECTED]/ws-test/org.apache.uima.runtimetoolkit.container/
[194]>
org.apache.uima.util;
version="0.0.0"<[EMAIL
PROTECTED]/ws-test/org.apache.uima.runtimetoolkit.container/
[194]>
>From the above imported resolution, "org.apache.uima.util" and "
org.apache.uima.jcas.tcas" come from the wrong plugin (Bundle#194) which
cause the problem for CDE to properly run.
It is a good idea to document this so that the tools that use UIMA plugin
will not create the wrong wiring as the above example.
Comment ?
- Tong
