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How do I get a thread dump to help track down a problem?
BEA WebLogic Questions and Answers
(Continued from previous question...)
How do I get a thread dump to help track down a problem?
Ways to get a thread dump:
* Try running this from the command line (after running the setEnv script in /bea/wlserver6.1/config/mydomain/):
java weblogic.Admin -url t3://localhost:7001 THREAD_DUMP
* On Windows, from the console window, enter Ctrl+Break.
* On UNIX, signal the server using kill -3.
(Continued on next question...)
Other Interview Questions
- What is BEA Weblogic?
- Which of the following statements are true regarding MDBs (Message Driven Beans) on version 6.0 of WebLogic App Server?
- Can I use a "native" two-tier driver for a browser applet?
- I'm using a WebLogic multitier driver in an applet as an interface to a DBMS ...
- I tried to run two of the applets in the examples directory of the distribution ...
- The two primary cluster services provided by WebLogic Server are?
- How do stubs work in a WebLogic Server cluster?
- What happens when a failure occurs and the stub cannot connect to a WebLogic Server instance?
- Why did my JDBC code throw a rollback SQLException?
- Must my bean-managed persistence mechanism use the WebLogic JTS driver?
- Why is there no polymorphic-type response from a create() or find() method?
- Must EJBs be homogeneously deployed across a cluster? Why?
- Which of the following are recommended practices to be performed in the ejbPassivate() method of a stateful session bean?
- While packaging the Web Application DefaultWebApp for deployment into the WebLogic server ...
- How do I set up my CLASSPATH?
- Why do I get the following exception when viewing the JNDI tree?
- When deploying a resource adapter (.rar) to WebLogic Server, are its classes placed in the WebLogic classpath?
- How is security handled in the WebLogic J2EE Connector Architecture?
- Can I enable requests to a JDBC connection pool for a database connection to wait until a connection is available?
- How do I use multibyte character sets with WebLogic jDriver for Informix?
- How do I connect to an SQL Server instance that is running on a machine with multiple instances of SQL Server 2000?
- Why does FOR UPDATE in Oracle 8 cause an ORA-01002 error?
- What causes an OCIW32.dll error?
- How do I use OS Authentication with WebLogic jDriver for Oracle and Connection Pools?
- What type of object is returned by ResultSet.getObject()?
- How do I limit the number of Oracle database connections generated by WebLogic Server?
- How do I call Oracle stored procedures that take no parameters?
- Why do I get unexpected characters from 8-bit character sets in WebLogic jDriver for Oracle?
- How do I learn what codesets are available in Oracle?
- How many deployment descriptor files does a CMP entity bean deployed on the WebLogic Server have?
- Why do I get an error while trying to retrieve the text for ORA-12705?
- Why do I run out of resources during updates with Oracle's database link?
- How do I prevent errors when running t3dbping?
- Why does executing the PreparedStatement class cause a "TRUNC fails: ORA-00932: inconsistent datatypes" error?
- Why am I getting an "ORA-01000: maximum open cursors exceeded" error, even though I closed all ResultSet, Statement, and Connection objects?
- An instance of stateful session EJB when accessed simultaneously from more than one clients on same VM results in RemoteException ...
- Are there C/C++ interfaces to WLS JMS?
- How do I start WLS and configure JMS?
- How do I configure JMS security?
- Can I still use the default connection factories supported in WebLogic Release 5.1?
- Why does JMSSession.createTopic or JMSSession.createQueue fail to create a destination in WLS JMS 6.1 (it worked in 5.1)?
- How do I programmatically get a list of Queues or Topics?
- How do I use a temporary destination?
- Can two JMS servers share the same persistent store?
- Which types of JDBC databases does WebLogic JMS support?
- How do I use a third-party JDBC driver with JMS?
- The Multicast TTL setting for a cluster in the WebLogic Admin console sets which of the following values?
- Which of the following algorithms is used by the WebLogic Server as the default load balancing strategy for ...
- How do I use persistence?
- How does a file store compare with a JDBC store?
- How do the WLS JMS 6.1 server/destination message maximum and threshold values work?
- How do I configure JDBC so that the JMS JDBC Store recovers automatically?
- Does WebLogic JMS support clustering?
- How do I do HTTP tunneling?
- Which of the following statements are true regarding the identity of two EJBs
- Why is my JMS work not part of a user transaction ....
- In the WebLogic server, if stateless session bean instances are getting frequently created and removed ...
- How can an application do a JMS operation and have it succeed, independent of the result of the transaction?
- What happens if acknowledge() is called within a transaction?
- Is it possible to set aside a message and acknowledge it later?
- How should I use sorted queues?
- Which of the following attributes in the Monitoring tab for a JDBC connection pool in the Administrative console ...
- The MaxPostTimeSecs attribute set in the Administration console under Servers or virtual hosts section corresponds ...
- How does sorting on message priority work?
- How do I get a thread dump to help track down a problem?
- How do I manage a queue to view and delete specific messages?
- Why do I get an exception when trying to find a connection factory?
- What precautions should I take when I use blocking receive() calls?
- What is the NO_ACKNOWLEDGE acknowledge mode used for?
- When should I use multicast subscribers?
- When should I use server session pools and connection consumers?
- How do I issue the close() method within an onMessage() method call and what are the semantics of the close() method?
- How do I publish an XML message?
- A client wants to preserve the reference to the EJBHome object of an enterprise bean instance ...
- Is it possible to send or receive a message from within a message listener?
- How do I create a producer pool?
- What are pending messages in the console?
- How do I use a less than or greater than on a message selector in ejb-jar.xml?
- Is it better to have more or fewer sessions for a given number of subscribers?
- Match the EJB functions given below with the functionality equivalent in SQL ...
- A client invokes a method on a stateful session bean instance deployed in the WebLogic Server ...
- Are foreign destinations handled within foreign JMS messages?
- What is the standard way to create threads, do initialization, etc. within the application server?
- How many messages are sent across the network for processing topic messages?
- What should an XPATH selector look like?
- How do I handle request/response using JMS?
- How do I put a message back on the queue for processing?
- Is it OK to add new sessions and subscribers to a Queue or Topic Connection once it has been started?
- What can I do when I get java.lang.OutOfMemoryError because producers are faster than consumers?
- Which of the following is NOT true about deploying EJBs in the WebLogic Server?
- How do I debug WebLogic Server using Visual Cafe 4.1?
- How can I avoid asynchronous message deadlocks?
- How does concurrency work for message-driven beans?
- Which of the following are valid relationships between JMS objects in the WebLogic Server?
- Can an MDB be a message producer or both a producer and consumer?
- Can you use a foreign JMS provider to drive an MDB transactionally?
- How do I use JTA transactions within an MDB?
- Why did the messaging bridge fail to connect to the source bridge destination?
- Can the messaging bridge handle two-phase or global transactions between separate WebLogic Server domains or between different releases?
- I configured the messaging bridge to use the Exactly-once quality of service for two-phase transactions. So why am I getting a "quality of service is unreachable" error?
- Can I configure the messaging bridge to automatically downgrade the quality of service ...
- When configuring a source or target messaging bridge destination, do I need to set the Adapter Classpath field?
- Can the messaging bridge forward durable subscription messages between separate WebLogic Server 6.1 and release 7.0 or later domains?
- How do I enable debugging for the messaging bridge?
- Which of the following is NOT true about the security implementation in the WebLogic Server?
- For EJB applications with bean-managed transaction demarcations ...
- Which of the following are true about the transaction support in the WebLogic server
- Which of the following programs can be created using the ZAC Publish Wizard tool?
- What do the messaging bridge monitoring states indicate on the Server -> Services ->Monitor -> Messaging Bridge Administration Console page?
- How do I configure WebLogic to use a SOCKS proxy?
- How does WebLogic support CORBA and client communication via IIOP?
- Can WebLogic Server start with a UNIX boot?
- Why do I get "NoClassDefFound"/"Too Many Open files"messages on Solaris? ...
- A stateful session bean implementing the SessionSynchronization interface is deployed on the WebLogic server ...
- The home of a Product CMP entity bean has a finder method, which returns an Enumeration of all the products ...
- Which is the only method defined in the javax.ejb.Handle interface?
- In CORBA, which of the following files generated by the "idltojava" compiler must be compiled before running the server application?
- Considering the code below, which of the lines of code...
- How do I increase WebLogic Server memory?
- What causes Java.io exceptions in the log file?
- Java-CORBA integration: RMI-IIOP or Java IDL?
- How do an RMI-IIOP application and an existing CORBA object interoperate?
- What is the function of T3 in WebLogic Server?
- How can I debug the Java code that I have running in WebLogic Server?
- How do I call a servlet with parameters in the URL?
- Which of the following are the benefits of MDB (Message Driven Beans) over standard JMS consumers?
- Which of the statements below is true for a web application using session management?
- How do I identify the document type of an XML document?
- Why can't I boot WebLogic Server when using the LDAP Security Realm?
- How can I run multiple instances of the same servlet class in the same WebLogic Server instance?
- How do I restrict access to servlets and JSPs?
- How do I protect WebLogic Server from security attacks from bogus clients using the WL-Proxy-Client-Cert header?
- Which XML parser comes with WebLogic Server 6.1?
- Can I use the getAttribute() and setAttribute() methods of Version 2.2 of the Java Servlet API to parse XML documents?
- How can I avoid ResourceExceptions when sending more requests for database connections from the pool than are currently available?
- How do I use Unicode codesets with the WebLogic jDriver for Oracle driver?
- How do I bind string values in a PreparedStatement?
- How do I look up an "ORA" SQLException?
- What is error "ORA-6502?"
- How can I control on which WebLogic Server(s) my application will run?
- How do I use a startup class to initialize and later reference JMS objects?
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