Ratha
Reputation: 9692
How can I find the root cause for class not found issue, in OSGi?
I want to try some steps to fix ClassNotFound issue. Im using Equinox/OSGI. For example, im getting
java.lang.ClassNotFoundException: org.wso2.carbon.tomcat.ext.servlet.DelegationServlet
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:532)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:514)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:133)
I tried, ss, ls -c, diag , b commands..but could not find any useful info from that. I put the output of those commands..
Can anybody let me know, how can i go through such OSgi issues and how can i figure out the root cause for such issues..
#osgi> p org.wso2.carbon.tomcat.ext.servlet
org.wso2.carbon.tomcat.ext.servlet; version="4.2.0"<org.wso2.carbon.tomcat.ext_4.2.0 [421]>
#osgi> diag 421
reference:file:../plugins/org.wso2.carbon.tomcat.ext_4.2.0.jar [421]
No unresolved constraints.
#osgi> b 421
org.wso2.carbon.tomcat.ext_4.2.0 [421]
Id=421, Status=ACTIVE Data Root=C:\Projects\scartch\chunk13\08_07_new\wso2am-1.7.1\repository\components\default\configuration\org.eclipse.osgi
\bundles\421\data
"No registered services."
Services in use:
{org.wso2.carbon.user.core.service.RealmService, org.wso2.carbon.user.api.UserRealmService}={service.id=136}
{org.wso2.carbon.tomcat.api.CarbonTomcatService}={service.id=130}
{org.wso2.carbon.base.api.ServerConfigurationService}={service.id=103}
{org.wso2.carbon.registry.core.service.RegistryService, org.wso2.carbon.registry.api.RegistryService}={service.id=143}
Exported packages
org.wso2.carbon.tomcat.ext.service; version="4.2.0"[exported]
org.wso2.carbon.tomcat.ext.scan; version="4.2.0"[exported]
org.wso2.carbon.tomcat.ext.valves; version="4.2.0"[exported]
org.wso2.carbon.tomcat.ext.saas; version="4.2.0"[exported]
org.wso2.carbon.tomcat.ext.utils; version="4.2.0"[exported]
org.wso2.carbon.tomcat.ext.filter; version="4.2.0"[exported]
org.wso2.carbon.tomcat.ext.realms; version="4.2.0"[exported]
org.wso2.carbon.tomcat.ext.transport; version="4.2.0"[exported]
org.wso2.carbon.tomcat.ext.servlet; version="4.2.0"[exported]
org.wso2.carbon.tomcat.ext.transport.statistics; version="4.2.0"[exported]
Imported packages
org.wso2.carbon.utils.multitenancy; version="4.2.0"<org.wso2.carbon.utils_4.2.0 [454]>
org.wso2.carbon.utils; version="4.2.0"<org.wso2.carbon.utils_4.2.0 [454]>
org.wso2.carbon.user.core.tenant; version="4.2.0"<org.wso2.carbon.user.core_4.2.0 [449]>
org.wso2.carbon.user.core.service; version="4.2.0"<org.wso2.carbon.user.core_4.2.0 [449]>
org.wso2.carbon.user.api; version="1.0.1"<org.wso2.carbon.user.api_4.2.0 [448]>
org.wso2.carbon.tomcat.api; version="4.2.0"<org.wso2.carbon.tomcat_4.2.0 [420]>
org.wso2.carbon.tomcat; version="4.2.0"<org.wso2.carbon.tomcat_4.2.0 [420]>
org.wso2.carbon.registry.core.service; version="1.0.1"<org.wso2.carbon.registry.core_4.2.0 [344]>
org.wso2.carbon.registry.core.ghostregistry; version="1.0.1"<org.wso2.carbon.registry.core_4.2.0 [344]>
org.wso2.carbon.registry.api; version="1.0.1"<org.wso2.carbon.registry.api_4.2.0 [341]>
org.wso2.carbon.core.session; version="4.2.0"<org.wso2.carbon.core_4.2.0 [197]>
org.wso2.carbon.core; version="4.2.0"<org.wso2.carbon.core_4.2.0 [197]>
org.wso2.carbon.context; version="4.2.0"<org.wso2.carbon.utils_4.2.0 [454]>
org.wso2.carbon.base.api; version="1.0.0"<org.wso2.carbon.base_4.2.0 [189]>
org.wso2.carbon.base; version="1.0.0"<org.wso2.carbon.base_4.2.0 [189]>
org.osgi.service.component; version="1.2.0"<org.eclipse.osgi.services_3.3.100.v20120522-1822 [132]>
org.eclipse.osgi.framework.adaptor; version="0.0.0"<org.eclipse.osgi_3.8.1.v20120830-144521 [0]>
org.eclipse.equinox.http.servlet; version="1.1.0"<org.eclipse.equinox.http.servlet_1.1.300.v20120522-1841 [102]>
org.apache.tomcat.util.scan; version="1.7.0"<tomcat_7.0.34.wso2v1 [494]>
org.apache.tomcat.util.res; version="1.7.0"<tomcat_7.0.34.wso2v1 [494]>
org.apache.tomcat.util.file; version="1.7.0"<tomcat_7.0.34.wso2v1 [494]>
org.apache.tomcat; version="1.7.0"<tomcat_7.0.34.wso2v1 [494]>
org.apache.juli.logging; version="7.0.34"<tribes_7.0.34.wso2v1 [496]>
org.apache.coyote; version="1.7.0"<org.wso2.carbon.tomcat.patch_4.2.0 [423]>
org.apache.commons.logging; version="1.1.1"<org.wso2.carbon.logging_4.2.0 [287]>
org.apache.catalina.valves; version="1.7.0"<tomcat_7.0.34.wso2v1 [494]>
org.apache.catalina.startup; version="1.7.0"<tomcat_7.0.34.wso2v1 [494]>
org.apache.catalina.realm; version="1.7.0"<tomcat_7.0.34.wso2v1 [494]>
org.apache.catalina.ha; version="1.7.0"<tomcat-ha_7.0.34.wso2v1 [495]>
org.apache.catalina.core; version="1.7.0"<tomcat_7.0.34.wso2v1 [494]>
org.apache.catalina.connector; version="1.7.0"<tomcat_7.0.34.wso2v1 [494]>
org.apache.catalina; version="1.7.0"<tomcat_7.0.34.wso2v1 [494]>
org.apache.axis2.clustering; version="1.6.1.wso2v10"<axis2_1.6.1.wso2v10 [13]>
javax.servlet.http; version="2.6.0"<javax.servlet_3.0.0.v201112011016 [57]>
javax.servlet; version="2.6.0"<javax.servlet_3.0.0.v201112011016 [57]>
No fragment bundles
Named class space
org.wso2.carbon.tomcat.ext; bundle-version="4.2.0"[provided]
No required bundles
#osgi> ls -c 421
Components in bundle org.wso2.carbon.tomcat.ext:
ID Component details
139 Component[
name = tomcat.ext.service.comp
factory = null
autoenable = true
immediate = true
implementation = org.wso2.carbon.tomcat.ext.internal.CarbonRealmServiceComponent
state = Unsatisfied
properties = {service.pid=tomcat.ext.service.comp}
serviceFactory = false
serviceInterface = null
references = {
Reference[name = user.realm.provider, interface = org.wso2.carbon.user.core.service.RealmService, policy = dynamic, cardinality = 1..1
, target = null, bind = setRealmService, unbind = unsetRealmService]
Reference[name = registry.service.provider, interface = org.wso2.carbon.registry.core.service.RegistryService, policy = dynamic, cardi
nality = 1..1, target = null, bind = setRegistryService, unbind = unsetRegistryService]
}
located in bundle = org.wso2.carbon.tomcat.ext_4.2.0 [421]
]
Dynamic information :
The component is satisfied
All component references are satisfied
Component configurations :
Configuration properties:
service.pid = tomcat.ext.service.comp
component.name = tomcat.ext.service.comp
component.id = 138
Instances:
org.eclipse.equinox.internal.ds.impl.ComponentInstanceImpl@68c19d85
Bound References:
String[org.wso2.carbon.registry.core.service.RegistryService,org.wso2.carbon.registry.api.RegistryService]
-> org.wso2.carbon.registry.core.jdbc.EmbeddedRegistryService@7f4cbc7d
String[org.wso2.carbon.user.core.service.RealmService,org.wso2.carbon.user.api.UserRealmService]
-> org.wso2.carbon.user.core.common.DefaultRealmService@6eaf3d6
140 Component[
name = tomcat.service.comp
factory = null
autoenable = true
immediate = true
implementation = org.wso2.carbon.tomcat.ext.internal.CarbonTomcatServiceComponent
state = Unsatisfied
properties = {service.pid=tomcat.service.comp}
serviceFactory = false
serviceInterface = null
references = {
Reference[name = server.configuration.service, interface = org.wso2.carbon.base.api.ServerConfigurationService, policy = dynamic, card
inality = 1..1, target = null, bind = setServerConfigurationService, unbind = unsetServerConfigurationService]
Reference[name = tomcat.service.provider, interface = org.wso2.carbon.tomcat.api.CarbonTomcatService, policy = dynamic, cardinality =
1..1, target = null, bind = setCarbonTomcatService, unbind = unsetCarbonTomcatService]
}
located in bundle = org.wso2.carbon.tomcat.ext_4.2.0 [421]
]
Dynamic information :
The component is satisfied
All component references are satisfied
Component configurations :
Configuration properties:
service.pid = tomcat.service.comp
component.name = tomcat.service.comp
component.id = 139
Instances:
org.eclipse.equinox.internal.ds.impl.ComponentInstanceImpl@2b2e6a26
Bound References:
String[org.wso2.carbon.base.api.ServerConfigurationService]
-> org.wso2.carbon.base.ServerConfiguration@4c309c86
String[org.wso2.carbon.tomcat.api.CarbonTomcatService]
-> org.wso2.carbon.tomcat.internal.CarbonTomcat@b74487e
Upvotes: 0
Views: 859
Answers (1)
Pawel Pogorzelski
Reputation: 721
You diagnosed the plugin providing the class. Looking at the requester might help as well.
In general troubleshooting OSGi class loading is hard. Incompatible libraries versions and duplicated libraries are the most popular causes of ClassNotFoundException. So, looking for config changes around the time of the crash might give you some hints.
Is the stack trace complete? If no you can paste the whole stack, might help.
Upvotes: 1
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