[STANBOL-775] SolrServerPublishingComponent needs to intercept the ContextClassLoader when instantiating the SolrDispatchFilter

• Type: Sub-task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: commons-0.11.0
• Component/s: Commons
• Assignee: Unassigned
• Reporter: Rupert Westenthaler
• Created: 13/Oct/12 10:52
• Updated: 22/Jan/13 12:08
• Resolved: 13/Oct/12 10:54

Description

The "org.apache.solr.servlet.SolrDispatchFilter" initialises within the constructor the Solr Adminhandler via the context Classloader. Because of that any Apache Solr version used by the host system is leaking into Apache Stanbol running within the embedded OSGI environment.

This causes Exceptions like

org.apache.solr.common.SolrException: java.lang.ClassCastException: org.apache.xerces.jaxp.DocumentBuilderFactoryImpl cannot be cast to javax.xml.parsers.DocumentBuilderFactory
at org.apache.solr.servlet.SolrDispatchFilter.<init>(SolrDispatchFilter.java:79) ~[solr-core-3.6.1.jar:3.6.1 1362471 - thetaphi - 2012-07-17 12:46:54]
at org.apache.stanbol.commons.solr.web.dispatch.DelegatingSolrDispatchFilter.<init>(DelegatingSolrDispatchFilter.java:80) ~[na:na]
at org.apache.stanbol.commons.solr.web.impl.SolrServerPublishingComponent$SolrFilter.<init>(SolrServerPublishingComponent.java:346) ~[na:na]
at org.apache.stanbol.commons.solr.web.impl.SolrServerPublishingComponent.updateFilter(SolrServerPublishingComponent.java:303) ~[na:na]
at org.apache.stanbol.commons.solr.web.impl.SolrServerPublishingComponent$1.addOrUpdate(SolrServerPublishingComponent.java:192) ~[na:na]
at org.apache.stanbol.commons.solr.web.impl.SolrServerPublishingComponent$1.addingService(SolrServerPublishingComponent.java:219) ~[na:na]
at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:896) ~[stanbol-embedded-0.11.0-LMF-SNAPSHOT.jar:0.11.0-LMF-SNAPSHOT]

To solve this the best options is that the SolrServerPublishingComponent replaces the context Classloader with the Bundle Classloader when instantiating the SolrFilter (line 304)