I will ask the people responsible for the Tomcat-server, but I don't think
that is the issue. 

I looked a bit deeper in the log-file now and found another stack trace that
is thrown before my original stacktrace:

2016-08-10 11:00:57,195 ERROR [geotools.jdbc] - There's code using JDBC
based datastore and not disposing them. This may lead to temporary loss of
database connections. Please make sure all data access code calls
DataStore.dispose() before freeing all references to it
getFeatureType(Unknown Source)
        at
org.geoserver.gwc.layer.CatalogConfiguration.isLayerExposable(CatalogConfiguration.java:453)
        at
org.geoserver.gwc.config.GWCInitializer.addLayersToNotCache(GWCInitializer.java:283)
        at
org.geoserver.gwc.config.GWCInitializer.initialize(GWCInitializer.java:153)
        at
org.geoserver.config.GeoServerLoader.loadInitializers(GeoServerLoader.java:147)
        at
org.geoserver.config.GeoServerLoader.postProcessBeforeInitialization(GeoServerLoader.java:127)
        at
org.geoserver.config.GeoServerLoaderProxy.postProcessBeforeInitialization(GeoServerLoaderProxy.java:59)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:408)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
        at
org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
        at
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
        at
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
        at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
        at
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
        at
org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
        at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
        at
org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444)
        at
org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326)
        at
org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
        at
org.geoserver.platform.GeoServerContextLoaderListener.contextInitialized(GeoServerContextLoaderListener.java:23)
        at
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4812)
        at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5255)
        at
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
        at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
        at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: Illegal access: this web
application instance has been stopped already. Could not load
[oracle.ucp.UniversalPooledConnection]. The following stack trace is thrown
for debugging purposes as well as to attempt to terminate the thread which
caused the illegal access.
        at
org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1318)
        at
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1181)
        at
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1142)
        ... 55 more
Caused by: java.lang.IllegalStateException: Illegal access: this web
application instance has been stopped already. Could not load
[oracle.ucp.UniversalPooledConnection]. The following stack trace is thrown
for debugging purposes as well as to attempt to terminate the thread which
caused the illegal access.
        at
org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1328)
        at
org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1316)
        ... 57 more
2016-08-10 11:00:42,424 WARN [data.jdbc] - Could not test 
org.geoserver.data.jdbc.GenericUnWrapper@29b28673 for unwrapping abilities
agaist oracle.jdbc.driver.T4CConnection@7ac1127b
java.lang.NoClassDefFoundError: oracle/jdbc/driver/OracleCloseCallback
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
        at java.lang.Class.privateGetPublicMethods(Class.java:2902)
        at java.lang.Class.privateGetPublicMethods(Class.java:2917)
        at java.lang.Class.getMethods(Class.java:1615)
        at
org.geoserver.data.jdbc.GenericUnWrapper.unwrapInternal(GenericUnWrapper.java:173)
        at
org.geoserver.data.jdbc.GenericUnWrapper.canUnwrap(GenericUnWrapper.java:108)
        at
org.geotools.data.jdbc.datasource.DataSourceFinder.getUnWrapper(DataSourceFinder.java:126)
        at
org.geotools.data.oracle.OracleDialect.unwrapConnection(OracleDialect.java:634)
        at
org.geotools.data.oracle.OracleNGDataStoreFactory.createDataStoreInternal(OracleNGDataStoreFactory.java:147)
        at
org.geotools.jdbc.JDBCJNDIDataStoreFactory.createDataStoreInternal(JDBCJNDIDataStoreFactory.java:184)
        at
org.geotools.jdbc.JDBCDataStoreFactory.createDataStore(JDBCDataStoreFactory.java:278)
        at
org.geotools.jdbc.JDBCDataStoreFactory.createDataStore(JDBCDataStoreFactory.java:54)
        at
org.vfny.geoserver.util.DataStoreUtils.getDataAccess(DataStoreUtils.java:90)
        at
org.geoserver.catalog.ResourcePool.getDataStore(ResourcePool.java:590)
        at
org.geoserver.catalog.ResourcePool.getCacheableFeatureType(ResourcePool.java:897)
        at
org.geoserver.catalog.ResourcePool.tryGetFeatureType(ResourcePool.java:884)
        at
org.geoserver.catalog.ResourcePool.getFeatureType(ResourcePool.java:878)
        at
org.geoserver.catalog.ResourcePool.getFeatureType(ResourcePool.java:865)
        at
org.geoserver.catalog.impl.FeatureTypeInfoImpl.getFeatureType(FeatureTypeInfoImpl.java:120)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at
org.geoserver.catalog.impl.ModificationProxy.invoke(ModificationProxy.java:147)
        at com.sun.proxy.$Proxy28.getFeatureType(Unknown Source)
        at
org.geoserver.gwc.layer.CatalogConfiguration.isLayerExposable(CatalogConfiguration.java:453)
        at
org.geoserver.gwc.config.GWCInitializer.addLayersToNotCache(GWCInitializer.java:283)
        at
org.geoserver.gwc.config.GWCInitializer.initialize(GWCInitializer.java:153)
        at
org.geoserver.config.GeoServerLoader.loadInitializers(GeoServerLoader.java:147)
        at
org.geoserver.config.GeoServerLoader.postProcessBeforeInitialization(GeoServerLoader.java:127)
        at
org.geoserver.config.GeoServerLoaderProxy.postProcessBeforeInitialization(GeoServerLoaderProxy.java:59)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:408)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
        at
org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
        at
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
        at
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
        at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
        at
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
        at
org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
        at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
        at
org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444)
        at
org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326)
        at
org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
        at
org.geoserver.platform.GeoServerContextLoaderListener.contextInitialized(GeoServerContextLoaderListener.java:23)
        at
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4812)
        at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5255)
        at
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
        at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
        at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: Illegal access: this web
application instance has been stopped already. Could not load
[oracle.jdbc.driver.OracleCloseCallback]. The following stack trace is
thrown for debugging purposes as well as to attempt to terminate the thread
which caused the illegal access.
        at
org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1318)
        at
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1181)
        at
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1142)
        ... 56 more
Caused by: java.lang.IllegalStateException: Illegal access: this web
application instance has been stopped already. Could not load
[oracle.jdbc.driver.OracleCloseCallback]. The following stack trace is
thrown for debugging purposes as well as to attempt to terminate the thread
which caused the illegal access.
        at
org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1328)
        at
org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1316)
        ... 58 more

Also many of this: 2016-08-10 11:00:42,516 ERROR [geotools.jdbc] - There's
code using JDBC based datastore and not disposing them. This may lead to
temporary loss of database connections. Please make sure all data access
code calls DataStore.dispose() before freeing all references to it

And

2016-08-10 11:00:42,550 WARN [data.jdbc] - Could not test 
org.geoserver.data.jdbc.GenericUnWrapper@29b28673 for unwrapping abilities
agaist com.sun.proxy.$Proxy16@73feb5ca
java.lang.NoClassDefFoundError: oracle/ucp/UniversalPooledConnection
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
        at java.lang.Class.privateGetPublicMethods(Class.java:2902)
        at java.lang.Class.getMethods(Class.java:1615)
        at
org.geoserver.data.jdbc.GenericUnWrapper.unwrapInternal(GenericUnWrapper.java:173)
        at
org.geoserver.data.jdbc.GenericUnWrapper.canUnwrap(GenericUnWrapper.java:108)
        at
org.geotools.data.jdbc.datasource.DataSourceFinder.getUnWrapper(DataSourceFinder.java:126)
        at
org.geotools.data.oracle.OracleDialect.unwrapConnection(OracleDialect.java:634)
        at
org.geotools.data.oracle.OracleNGDataStoreFactory.createDataStoreInternal(OracleNGDataStoreFactory.java:147)
        at
org.geotools.jdbc.JDBCJNDIDataStoreFactory.createDataStoreInternal(JDBCJNDIDataStoreFactory.java:184)
        at
org.geotools.jdbc.JDBCDataStoreFactory.createDataStore(JDBCDataStoreFactory.java:278)
        at
org.geotools.jdbc.JDBCDataStoreFactory.createDataStore(JDBCDataStoreFactory.java:54)
        at
org.vfny.geoserver.util.DataStoreUtils.getDataAccess(DataStoreUtils.java:90)
        at
org.geoserver.catalog.ResourcePool.getDataStore(ResourcePool.java:590)
        at
org.geoserver.catalog.ResourcePool.getCacheableFeatureType(ResourcePool.java:897)
        at
org.geoserver.catalog.ResourcePool.tryGetFeatureType(ResourcePool.java:884)
        at
org.geoserver.catalog.ResourcePool.getFeatureType(ResourcePool.java:878)
        at
org.geoserver.catalog.ResourcePool.getFeatureType(ResourcePool.java:865)
        at
org.geoserver.catalog.impl.FeatureTypeInfoImpl.getFeatureType(FeatureTypeInfoImpl.java:120)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at
org.geoserver.catalog.impl.ModificationProxy.invoke(ModificationProxy.java:147)
        at com.sun.proxy.$Proxy28.getFeatureType(Unknown Source)
        at
org.geoserver.gwc.layer.CatalogConfiguration.isLayerExposable(CatalogConfiguration.java:453)
        at
org.geoserver.gwc.config.GWCInitializer.addLayersToNotCache(GWCInitializer.java:283)
        at
org.geoserver.gwc.config.GWCInitializer.initialize(GWCInitializer.java:153)
        at
org.geoserver.config.GeoServerLoader.loadInitializers(GeoServerLoader.java:147)
        at
org.geoserver.config.GeoServerLoader.postProcessBeforeInitialization(GeoServerLoader.java:127)
        at
org.geoserver.config.GeoServerLoaderProxy.postProcessBeforeInitialization(GeoServerLoaderProxy.java:59)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:408)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
        at
org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
        at
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
        at
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
        at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
        at
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
        at
org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
        at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
        at
org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444)
        at
org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326)
        at
org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
        at
org.geoserver.platform.GeoServerContextLoaderListener.contextInitialized(GeoServerContextLoaderListener.java:23)
        at
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4812)
        at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5255)
        at
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
        at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
        at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: Illegal access: this web
application instance has been stopped already. Could not load
[oracle.ucp.UniversalPooledConnection]. The following stack trace is thrown
for debugging purposes as well as to attempt to terminate the thread which
caused the illegal access.
        at
org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1318)
        at
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1181)
        at
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1142)
        ... 55 more
Caused by: java.lang.IllegalStateException: Illegal access: this web
application instance has been stopped already. Could not load
[oracle.ucp.UniversalPooledConnection]. The following stack trace is thrown
for debugging purposes as well as to attempt to terminate the thread which
caused the illegal access.
        at
org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1328)
        at
org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1316)
        ... 57 more
2016-08-10 11:00:42,552 WARN [data.jdbc] - Could not test 
org.geoserver.data.jdbc.GenericUnWrapper@29b28673 for unwrapping abilities
agaist oracle.jdbc.driver.T4CConnection@2f1d387d
java.lang.NoClassDefFoundError: oracle/jdbc/driver/OracleCloseCallback
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
        at java.lang.Class.privateGetPublicMethods(Class.java:2902)
        at java.lang.Class.privateGetPublicMethods(Class.java:2917)
        at java.lang.Class.getMethods(Class.java:1615)
        at
org.geoserver.data.jdbc.GenericUnWrapper.unwrapInternal(GenericUnWrapper.java:173)
        at
org.geoserver.data.jdbc.GenericUnWrapper.canUnwrap(GenericUnWrapper.java:108)
        at
org.geotools.data.jdbc.datasource.DataSourceFinder.getUnWrapper(DataSourceFinder.java:126)
        at
org.geotools.data.oracle.OracleDialect.unwrapConnection(OracleDialect.java:634)
        at
org.geotools.data.oracle.OracleNGDataStoreFactory.createDataStoreInternal(OracleNGDataStoreFactory.java:147)
        at
org.geotools.jdbc.JDBCJNDIDataStoreFactory.createDataStoreInternal(JDBCJNDIDataStoreFactory.java:184)
        at
org.geotools.jdbc.JDBCDataStoreFactory.createDataStore(JDBCDataStoreFactory.java:278)
        at
org.geotools.jdbc.JDBCDataStoreFactory.createDataStore(JDBCDataStoreFactory.java:54)
        at
org.vfny.geoserver.util.DataStoreUtils.getDataAccess(DataStoreUtils.java:90)
        at
org.geoserver.catalog.ResourcePool.getDataStore(ResourcePool.java:590)
        at
org.geoserver.catalog.ResourcePool.getCacheableFeatureType(ResourcePool.java:897)
        at
org.geoserver.catalog.ResourcePool.tryGetFeatureType(ResourcePool.java:884)
        at
org.geoserver.catalog.ResourcePool.getFeatureType(ResourcePool.java:878)
        at
org.geoserver.catalog.ResourcePool.getFeatureType(ResourcePool.java:865)
        at
org.geoserver.catalog.impl.FeatureTypeInfoImpl.getFeatureType(FeatureTypeInfoImpl.java:120)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at
org.geoserver.catalog.impl.ModificationProxy.invoke(ModificationProxy.java:147)
        at com.sun.proxy.$Proxy28.getFeatureType(Unknown Source)
        at
org.geoserver.gwc.layer.CatalogConfiguration.isLayerExposable(CatalogConfiguration.java:453)
        at
org.geoserver.gwc.config.GWCInitializer.addLayersToNotCache(GWCInitializer.java:283)
        at
org.geoserver.gwc.config.GWCInitializer.initialize(GWCInitializer.java:153)
        at
org.geoserver.config.GeoServerLoader.loadInitializers(GeoServerLoader.java:147)
        at
org.geoserver.config.GeoServerLoader.postProcessBeforeInitialization(GeoServerLoader.java:127)
        at
org.geoserver.config.GeoServerLoaderProxy.postProcessBeforeInitialization(GeoServerLoaderProxy.java:59)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:408)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
        at
org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
        at
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
        at
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
        at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
        at
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
        at
org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
        at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
        at
org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444)
        at
org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326)
        at
org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
        at
org.geoserver.platform.GeoServerContextLoaderListener.contextInitialized(GeoServerContextLoaderListener.java:23)
        at
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4812)
        at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5255)
        at
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
        at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
        at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: Illegal access: this web
application instance has been stopped already. Could not load
[oracle.jdbc.driver.OracleCloseCallback]. The following stack trace is
thrown for debugging purposes as well as to attempt to terminate the thread
which caused the illegal access.
        at
org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1318)
        at
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1181)
        at
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1142)
        ... 56 more
Caused by: java.lang.IllegalStateException: Illegal access: this web
application instance has been stopped already. Could not load
[oracle.jdbc.driver.OracleCloseCallback]. The following stack trace is
thrown for debugging purposes as well as to attempt to terminate the thread
which caused the illegal access.
        at
org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1328)
        at
org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1316)
        ... 58 more








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