Oracle listener up but instance connection blocked ORA-12528 / ORA-12505!
25722
ORA-12528 and ORA-12505 error on Oracle database 11g
23317
How do I fix a NoSuchMethodError?
16028
Java listener must inherit from java.util.EventListener - why?
38443
ExecuteReader requires an open and available Connection. The connection's current state is closed
9858
The infamous java.sql.SQLException: No suitable driver found
116805
session.connection() deprecated on Hibernate?
97015
111: Connection Refused
10623
Java Error: "Your security settings have blocked a local application from running"
62311
Cannot connect to my local instance
84786
ExecuteReader requires an open and available Connection. The connection's current state is Connecting
8030
System.SObjectException: ORA-20001 when deploying Changeset for users
139395
com.sun.istack.SAXException2 : Instance ... is substituting "java.lang.Object", but ... is bound to an anonymous type
84672
Dealing with ArcSDE connection limit exceeded?
125639
client denied by server configuration
125203
Something is blocking port 25 - how to debug?
49221
ORA-01180 when restoring the database
113835
kworker blocked for more than 120 seconds Ubuntu 17.10