Home » Archived » BIRT » RCP WebViewer + classloader + connection
| RCP WebViewer + classloader + connection [message #264518] |
Tue, 15 January 2008 15:48  |
Eclipse User |
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Originally posted by: georg.raffer.salomon.at
Hi guys,
I just integrated the BIRT report engine into a RCP app. The reports are
rendered as PDF and displayed with the integrated browser.
The classloader is modified using the EngineConfig:
EngineConstants.APPCONTEXT_CLASSLOADER_KEY
because specific report helper classes are located in a plugin.
Additionally a specific java.sql.Connection is set.
Now I want to use the org.eclipse.birt.report.viewer.utilities.WebViewer
within the RCP application. It seems to be very simple to render the
reports:
System.setProperty( "RUN_UNDER_ECLIPSE", "true" );
WebViewer.startup(browser);
String reportFile = "report_integration.rptdesign";
WebViewer.display(reportFile, WebViewer.HTML, browser, "frameset");
This works fine so far, but the specific report helper classes are not
found. Is it possible to set a specific class loader and ResourceLocator
for the WebViewer as it is possible for the report render engine?
Thanks!
bye, Georg
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| Re: RCP WebViewer + classloader + connection [message #264598 is a reply to message #264518] |
Wed, 16 January 2008 05:59  |
| Eclipse User |
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Originally posted by: jasonweathersby.alltel.net
Georg,
I believe others have solved this by calling:
WebappAccessor.start (
ViewerPlugin.WEBAPP_CONTEXT,
yourplugin.PLUGIN_ID,
Path.EMPTY
);
before WebViewer.display
Where yourplugin is the plugin calling the WebViewer and it should have
its classloader with access to your extra classes.
Jason
Georg Raffer wrote:
> Hi guys,
>
> I just integrated the BIRT report engine into a RCP app. The reports are
> rendered as PDF and displayed with the integrated browser.
> The classloader is modified using the EngineConfig:
>
> EngineConstants.APPCONTEXT_CLASSLOADER_KEY
>
> because specific report helper classes are located in a plugin.
> Additionally a specific java.sql.Connection is set.
>
> Now I want to use the org.eclipse.birt.report.viewer.utilities.WebViewer
> within the RCP application. It seems to be very simple to render the
> reports:
>
> System.setProperty( "RUN_UNDER_ECLIPSE", "true" );
> WebViewer.startup(browser);
> String reportFile = "report_integration.rptdesign";
> WebViewer.display(reportFile, WebViewer.HTML, browser, "frameset");
>
> This works fine so far, but the specific report helper classes are not
> found. Is it possible to set a specific class loader and ResourceLocator
> for the WebViewer as it is possible for the report render engine?
>
> Thanks!
>
> bye, Georg
>
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| Re: RCP WebViewer + classloader + connection [message #264610 is a reply to message #264598] |
Wed, 16 January 2008 13:05 |
| Eclipse User |
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Originally posted by: georg.raffer.salomon.at
Hi Jason,
Thank you for your reply. I tried your recommendations, but it didn't work.
What I did:
I tried to use it as explained:
System.setProperty( "RUN_UNDER_ECLIPSE", "true" );
WebappAccessor.start (ViewerPlugin.WEBAPP_CONTEXT,
"myplugin.id.comes.here", Path.EMPTY);
String reportFile = "c:/temp/report_integration.rptdesign";
WebViewer.display(reportFile, WebViewer.HTML, browser, "frameset");
Replacing "myplugin.id.comes.here" with my plugin name. Than a 404 error
is displayed in the browser. It seems that tomcat startup fails.
DOES ANYBODY KNOW where the logs (embedded tomcat) are written to?
Next I tried to modify the viewer plugin:
I changed WebappAccessor in that way that it uses a classloader that
searches in the viewer bundle and my bundle:
public Class loadClass(String className) throws ClassNotFoundException {
System.out.println("Loading class: " + className);
try{
return super.loadClass(className);
}catch (ClassNotFoundException e) {
if(bundle2!=null){ // this is the bundle that contains my report
bundle
return bundle2.loadClass(className);
}else{
throw e;
}
}
}
Neither loadClass, nor getResource tried to load a class or image used by
the report. It seems that this is not the classloader responsible for my
webapp (rendering the report).
I know this is tricky, but do you have any ideas?
Thank you!
bye, Georg
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| Re: RCP WebViewer + classloader + connection [message #264627 is a reply to message #264610] |
Wed, 16 January 2008 14:59 |
 Snjezana Peco
Messages: 789
Registered: July 2009 |
Senior Member |
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Try to add org.eclipse.birt.report.viewer as a dependent plugin to your
plugin ("myplugin.id.comes.here")
Snjeza
Georg Raffer wrote:
> Hi Jason,
>
> Thank you for your reply. I tried your recommendations, but it didn't work.
>
> What I did:
>
> I tried to use it as explained:
>
> System.setProperty( "RUN_UNDER_ECLIPSE", "true" );
>
> WebappAccessor.start (ViewerPlugin.WEBAPP_CONTEXT,
> "myplugin.id.comes.here", Path.EMPTY);
>
> String reportFile = "c:/temp/report_integration.rptdesign";
> WebViewer.display(reportFile, WebViewer.HTML, browser, "frameset");
>
>
> Replacing "myplugin.id.comes.here" with my plugin name. Than a 404 error
> is displayed in the browser. It seems that tomcat startup fails.
> DOES ANYBODY KNOW where the logs (embedded tomcat) are written to?
>
> Next I tried to modify the viewer plugin:
>
> I changed WebappAccessor in that way that it uses a classloader that
> searches in the viewer bundle and my bundle:
>
> public Class loadClass(String className) throws ClassNotFoundException {
> System.out.println("Loading class: " + className);
> try{
> return super.loadClass(className);
> }catch (ClassNotFoundException e) {
> if(bundle2!=null){ // this is the bundle that contains my report bundle
> return bundle2.loadClass(className);
> }else{
> throw e; }
> }
> }
>
> Neither loadClass, nor getResource tried to load a class or image used
> by the report. It seems that this is not the classloader responsible for
> my webapp (rendering the report).
>
> I know this is tricky, but do you have any ideas?
> Thank you!
>
> bye, Georg
>
>
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| Re: RCP WebViewer + classloader + connection [message #264645 is a reply to message #264610] |
Wed, 16 January 2008 15:59 |
| Eclipse User |
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Originally posted by: jasonweathersby.alltel.net
Georg,
Does your plugin have dependencies on your helper plugin?
Jason
Georg Raffer wrote:
> Hi Jason,
>
> Thank you for your reply. I tried your recommendations, but it didn't work.
>
> What I did:
>
> I tried to use it as explained:
>
> System.setProperty( "RUN_UNDER_ECLIPSE", "true" );
>
> WebappAccessor.start (ViewerPlugin.WEBAPP_CONTEXT,
> "myplugin.id.comes.here", Path.EMPTY);
>
> String reportFile = "c:/temp/report_integration.rptdesign";
> WebViewer.display(reportFile, WebViewer.HTML, browser, "frameset");
>
>
> Replacing "myplugin.id.comes.here" with my plugin name. Than a 404 error
> is displayed in the browser. It seems that tomcat startup fails.
> DOES ANYBODY KNOW where the logs (embedded tomcat) are written to?
>
> Next I tried to modify the viewer plugin:
>
> I changed WebappAccessor in that way that it uses a classloader that
> searches in the viewer bundle and my bundle:
>
> public Class loadClass(String className) throws ClassNotFoundException {
> System.out.println("Loading class: " + className);
> try{
> return super.loadClass(className);
> }catch (ClassNotFoundException e) {
> if(bundle2!=null){ // this is the bundle that contains my report bundle
> return bundle2.loadClass(className);
> }else{
> throw e; }
> }
> }
>
> Neither loadClass, nor getResource tried to load a class or image used
> by the report. It seems that this is not the classloader responsible for
> my webapp (rendering the report).
>
> I know this is tricky, but do you have any ideas?
> Thank you!
>
> bye, Georg
>
>
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| Re: RCP WebViewer + classloader + connection [message #264669 is a reply to message #264665] |
Wed, 16 January 2008 17:30 |
| Eclipse User |
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Originally posted by: jasonweathersby.alltel.net
You have to add the birt directory from the viewer plugin to your plugin
("myplugin.id.comes.here"
WebappAccessor.start (ViewerPlugin.WEBAPP_CONTEXT,
"myplugin.id.comes.here", Path.EMPTY);
Then add the following dependencies
Require-Bundle: org.eclipse.ui,
org.eclipse.core.runtime,
org.eclipse.birt.report.viewer,
org.eclipse.help.base,
org.eclipse.help.appserver,
org.eclipse.birt.chart.reportitem.ui,
testdata,
org.eclipse.birt.core,
org.eclipse.birt.report.engine,
org.eclipse.birt.data,
org.eclipse.birt.report.data.adapter,
org.eclipse.birt.chart.engine,
org.eclipse.birt.report.model;bundle-version="[2.1.0,3.0.0) "
A better work around may be to just load the plugins you need in the
report using script similar to this:
importPackage( Packages.org.eclipse.core.runtime );
mybundle = Platform.getBundle("my.test.pack");
gdc = mybundle.loadClass("my.test.pack.GetData");
gd = gdc.newInstance();
gd.myMethod();
Jason
Snjezana Peco wrote:
> sorry
> <your_workspace>/.metadata/.plugins/org.eclipse.tomcat
> Snjezana Peco wrote:
>> <your_workspace>/.metadata/.plugins/com.rpc.core.tomcat
>> You can also try buddy classloading.
>>
>> Snjeza
>>
>> Georg Raffer wrote:
>>> Hi Snjeza,
>>>
>>> Thanks! I already tried this, but it didn't help.
>>> Any ideas? Are there more dependencies required? Do you know where to
>>> find the embedded tomcat logfile?
>>>
>>> bye, Georg
>>>
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