Oracle error: SQLState(null) vendor code(17133)

Reported by Noah Campbell in CONF-2675, this keeps showing up in the logs, but doesn't have any visible effect on the system:

SQLException: SQLState(null) vendor code(17133)
java.sql.SQLException: Attempt to set Escape Processing after SQL is already processed
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:125)
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:162)
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:227)
        at oracle.jdbc.driver.OracleSql.setEscapeProcessing(OracleSql.java:343)
        at oracle.jdbc.driver.OraclePreparedStatement.setEscapeProcessing(OraclePreparedStatement.java:3190)
        at weblogic.jdbc.common.internal.ConnectionEnv.cleanUpStatementForReUse(ConnectionEnv.java:1080)
        at weblogic.jdbc.common.internal.ConnectionEnv.returnCachedStatement(ConnectionEnv.java:883)
        at weblogic.jdbc.wrapper.Statement.internalClose(Statement.java:271)
        at weblogic.jdbc.wrapper.Statement.close(Statement.java:293)
        at net.sf.hibernate.impl.BatcherImpl.closePreparedStatement(BatcherImpl.java:270)
        at net.sf.hibernate.impl.BatcherImpl.closeStatement(BatcherImpl.java:140)
        at net.sf.hibernate.impl.BatcherImpl.closeQueryStatement(BatcherImpl.java:156)
        at net.sf.hibernate.impl.BatcherImpl.closeQueryStatement(BatcherImpl.java:103)
        at net.sf.hibernate.loader.Loader.doQuery(Loader.java:302)
        at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:133)
        at net.sf.hibernate.loader.Loader.doList(Loader.java:1033)
        at net.sf.hibernate.loader.Loader.list(Loader.java:1024)
        at net.sf.hibernate.hql.QueryTranslator.list(QueryTranslator.java:854)
        at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1544)
        at net.sf.hibernate.impl.QueryImpl.list(QueryImpl.java:39)
        at bucket.user.persistence.dao.hibernate.BucketPropertySetDAO.getKeys(BucketPropertySetDAO.java:80)
        at sun.reflect.GeneratedMethodAccessor1141.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at org.springframework.aop.framework.AopProxyUtils.invokeJoinpointUsingReflection(AopProxyUtils.java:61)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:149)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:116)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:56)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:138)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:152)
        at $Proxy50.getKeys(Unknown Source)
        at com.opensymphony.module.propertyset.hibernate.HibernatePropertySet.getKeys(HibernatePropertySet.java:53)
        at com.atlassian.confluence.user.providers.jira.ConditionalPropertySet.getKeys(ConditionalPropertySet.java:37)
        at com.opensymphony.module.propertyset.AbstractPropertySet.getKeys(AbstractPropertySet.java:292)
        at bucket.propertyset.CachingPropertySet.getKeys(CachingPropertySet.java:261)
        at com.opensymphony.module.propertyset.PropertySetCloner.cloneProperties(PropertySetCloner.java:114)
        at com.opensymphony.module.propertyset.PropertySetManager.clone(PropertySetManager.java:61)
        at bucket.propertyset.CachingPropertySet.init(CachingPropertySet.java:65)
        at com.opensymphony.module.propertyset.PropertySetManager.getInstance(PropertySetManager.java:45)
        at com.opensymphony.module.propertyset.PropertySetManager.getInstance(PropertySetManager.java:22)
        at com.atlassian.core.user.preferences.UserPreferences.<init>(UserPreferences.java:56)
        at com.atlassian.core.user.preferences.UserPreferences.<init>(UserPreferences.java:38)
        at com.atlassian.confluence.user.DefaultUserAccessor.getDeactivatedUsers(DefaultUserAccessor.java:60)
        at com.atlassian.confluence.user.DefaultUserAccessor.initCaches(DefaultUserAccessor.java:74)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at org.springframework.aop.framework.AopProxyUtils.invokeJoinpointUsingReflection(AopProxyUtils.java:61)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:149)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:116)
        at com.atlassian.confluence.util.profiling.SpringProfilingInterceptor.invoke(SpringProfilingInterceptor.java:16)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:138)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:56)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:138)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:152)
        at $Proxy55.initCaches(Unknown Source)
        at com.atlassian.confluence.user.UserCacheFillerJob.doExecute(UserCacheFillerJob.java:23)
        at bucket.event.jobs.AbstractJob.executeInternal(AbstractJob.java:85)
        at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:66)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:191)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:516)