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This is a modularization issue. Adding the MVEL JAR to the plugin
will cause the LinkageError, as the forge-core classes will depend
on the MVEL classes loaded from the forge-core module(s), and the
plugin module will use the MVEL JAR classes packaged with it (so if
there's a hierarchy that crosses the plugin/core boundary, this will
crash). The only good solution I can see is to add a module
dependency on the MVEL module (or the module in which MVEL lives in
forge-core).<br>
<br>
AFAICT, depending on seam-render and adjusting seam-render module
definition to export the MVEL classes should take care of this (if
it's ever acceptable from a visibility perspective to depend on MVEL
directly).<br>
<br>
<br>
On 12-02-14 10:09 AM, Ryan Bradley wrote:
<blockquote cite="mid:4F3A7920.9030601@redhat.com" type="cite">
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Lincoln, frankly, I'm stumped by this one. I never received a
LoaderConstraintViolation or anything similar. My issue was with
the seam-render not being added as a module to the plugin, since
it was already included with the Forge core. However, that issue
has since been resolved.<br>
<br>
Thomas, I'm not sure of the cause of your exception, as including
seam-render and MVEL as dependencies solved the problem for me.
If I understand your most recent e-mail correctly, your problem is
solved if MVEL is manually added to module.xml? MVEL is not
required for my ScaffoldProvider implementation, so maybe you are
experiencing a similar problem?<br>
<br>
Sorry,<br>
Ryan<br>
<br>
On 02/13/2012 07:15 PM, Lincoln Baxter, III wrote:
<blockquote
cite="mid:CAEp_U4F+SL0g-WtVKxzLeaNEKXBxQP_o_cY3nbbYzEcRBctnZw@mail.gmail.com"
type="cite">Ryan, how did you get around this?<br>
<br>
Thomas, perhaps you could try including seam-render instead of
MVEL? Make sure you use the same version that Forge Shell uses
as a temporary workaround.<br>
<br>
~Lincoln<br>
<br>
<div class="gmail_quote"> On Mon, Feb 13, 2012 at 5:33 PM,
Thomas Frühbeck <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:fruehbeck@aon.at">fruehbeck@aon.at</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex"> Hi Ryan,
Lincoln<br>
<div class="im"><br>
> I ran into similar problems with my own plugin
development. Including<br>
> MVEL as a Maven dependency in your pom.xml should
resolve this issue.<br>
<br>
</div>
this is exactly what I have tried to do. This will really
look ugly :/<br>
I will write it as clear as possible:<br>
<br>
in pom.xml I added:<br>
<dependency><br>
<groupId>org.mvel</groupId><br>
<artifactId>mvel2</artifactId><br>
<scope>compile</scope><br>
</dependency><br>
<br>
On forge install-plugin ~/blabla/ I get:<br>
***SUCCESS*** Installed from [plugin-faces-idaware]
successfully.<br>
Wrote
/home/thomas/.forge/plugins/at/tfr/forge/plugin-faces-id-aware<br>
Wrote
/home/thomas/.forge/plugins/at/tfr/forge/plugin-faces-id-aware/1.0.0-SNAPSHOT-6c38c8fd-45f4-4736-ad0a-467dc9154a11<br>
Wrote
/home/thomas/.forge/plugins/at/tfr/forge/plugin-faces-id-aware/1.0.0-SNAPSHOT-6c38c8fd-45f4-4736-ad0a-467dc9154a11/plugin-faces-id-aware.jar<br>
Wrote
/home/thomas/.forge/plugins/at/tfr/forge/plugin-faces-id-aware/1.0.0-SNAPSHOT-6c38c8fd-45f4-4736-ad0a-467dc9154a11/module.xml<br>
Wrote
/home/thomas/.forge/plugins/at/tfr/forge/plugin-faces-id-aware/dependencies<br>
Wrote
/home/thomas/.forge/plugins/at/tfr/forge/plugin-faces-id-aware/dependencies/1.0.0-SNAPSHOT-6c38c8fd-45f4-4736-ad0a-467dc9154a11<br>
Wrote
/home/thomas/.forge/plugins/at/tfr/forge/plugin-faces-id-aware/dependencies/1.0.0-SNAPSHOT-6c38c8fd-45f4-4736-ad0a-467dc9154a11/metawidget-all-2.0.jar<br>
Wrote
/home/thomas/.forge/plugins/at/tfr/forge/plugin-faces-id-aware/dependencies/1.0.0-SNAPSHOT-6c38c8fd-45f4-4736-ad0a-467dc9154a11/mvel2-2.1.Beta7.jar<br>
Wrote
/home/thomas/.forge/plugins/at/tfr/forge/plugin-faces-id-aware/dependencies/1.0.0-SNAPSHOT-6c38c8fd-45f4-4736-ad0a-467dc9154a11/module.xml<br>
<br>
So to me it is clear, that I was successful, integration of
Mvel libraries is done.<br>
But when I invoke my plugin, I get _a
LoaderConstraintViolation_!!<br>
<br>
[myidaware] myidaware $ set VERBOSE true<br>
[myidaware] myidaware $ scaffold from-entity
at.tfr.test.model.* --scaffoldType idaware<br>
Use which scaffold provider?<br>
<br>
1 - [idaware]<br>
2 - [faces]*<br>
<br>
? Choose an option by typing the number of the selection
[*-default] [0] 1<br>
<div class="im">***ERROR*** [scaffold from-entity] loader
constraint violation: loader (instance of
org/jboss/modules/ModuleClassLoader) previously initiated
loading for a different type with name
"org/mvel2/templates/CompiledTemplate"<br>
</div>
org.jboss.forge.shell.exceptions.CommandExecutionException:
loader constraint violation: loader (instance of
org/jboss/modules/ModuleClassLoader) previously initiated
loading for a different type with name
"org/mvel2/templates/CompiledTemplate"<br>
<br>
Caused by: java.lang.LinkageError: loader constraint
violation: loader (instance of
org/jboss/modules/ModuleClassLoader) previously initiated
loading for a different type with name
"org/mvel2/templates/CompiledTemplate"<br>
<br>
<br>
So for me it is evident, that I brought my own Mvel jar, but
the module loader will not let me use it!<br>
<div class="HOEnZb">
<div class="h5"><br>
Regards,<br>
Thomas<br>
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</blockquote>
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<br>
<br clear="all">
<br>
-- <br>
Lincoln Baxter, III<br>
<a moz-do-not-send="true" href="http://ocpsoft.com">http://ocpsoft.com</a><br>
<a moz-do-not-send="true" href="http://scrumshark.com">http://scrumshark.com</a><br>
"Keep it Simple"<br>
<br>
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