Preparing for an interview about managing Java applications at the enterprise level? You may face questions about the WebLogic Server, a widely used Java application server. To impress your interviewer and get the job, prepare by mastering WebLogic Architecture, features, and configuration settings. This guide provides expert tips and common interview questions.
In this article, we will cover the following:
Most Frequently Asked WebLogic Interview Questions |
Ans:
Ans:
Ans:
Ans: We can use Java WebLogic. Admin PING to check if we get a normal response. We need to take multiple thread dumps with kill -3 paid on Unix and CTLR Break on Windows. Analyze the thread dump to find the root cause.
Ans: Memory leak, database query taking a long time to return, Deadlock.
Ans: A memory leak is when objects are not removed from the heap even when they are not required.
| Inclined to build a profession as Weblogic Developer? Then here is the blog post on, explore Weblogic Training |
Ans:
Q8) How to troubleshoot and overcome such issues?
Ans:
Ans: It occurs when one process or one thread utilizes an unexpectedly high proportion of CPU.
Ans: In the Solaris environment, we need to take pstack and prstack and see what the threads are doing. In Windows, we need to use pslist and process explorer.
Ans:
Ans: Members of the Cluster communicate over the Cluster Multicast IP and Port by sending periodic heartbeat messages.
Ans:
Tuning JVM Parameters:
If you have a single processor, a single-thread machine then you should use the serial collector (default for some configurations, can be enabled explicitly for with -XX:+UseSerialGC). For multiprocessor machines where your workload is basically CPU bound, use the parallel collector. This is enabled by default if you use the -server flag, or you can enable it explicitly with -XX:+UseParallelGC. If you’d rather keep the GC pauses shorter at the expense of using more total CPU time for GC, and you have more than one CPU, you can use the concurrent collector (-XX:+UseConcMarkSweepGC). Note that the concurrent collector tends to require more RAM allocated to the JVM than the serial or parallel collectors for a given workload because some memory fragmentation can occur.
| Checkout Our Blog on WebLogic Tutorial |
Ans: It can be categorized into 4 parts. a. Application Tuning. jsp precompilation, ejb pool size cache...
Setting the TCP IP parameter. tcp_time_wait_interval tcp_conn_req_max_q
tune work manager, tune chuck size and chunk pool size, using performance packs, connection backlog buffering.
tuning gc strategy, monitoring garbage collection.
Ans:
Development Mode:
Production Mode:
Ans:
Ans:
Note: All of these protocols are, by default, multiplexed over the same connection to the server’s address and port. So you can access a web page hosted by the server using a URL such as http://host:port/page.jsp. An external client can set up an initial JNDI context to a server using the URL t3://host: port/. All that has changed is the protocol over which the client must communicate with the server.
e:T4def,Preparing for an interview about managing Java applications at the enterprise level? You may face questions about the WebLogic Server, a widely used Java application server. To impress your interviewer and get the job, prepare by mastering WebLogic Architecture, features, and configuration settings. This guide provides expert tips and common interview questions.
In this article, we will cover the following:
Most Frequently Asked WebLogic Interview Questions |
Ans:
Ans:
Ans:
Ans: We can use Java WebLogic. Admin PING to check if we get a normal response. We need to take multiple thread dumps with kill -3 paid on Unix and CTLR Break on Windows. Analyze the thread dump to find the root cause.
Ans: Memory leak, database query taking a long time to return, Deadlock.
Ans: A memory leak is when objects are not removed from the heap even when they are not required.
| Inclined to build a profession as Weblogic Developer? Then here is the blog post on, explore Weblogic Training |
Ans:
Q8) How to troubleshoot and overcome such issues?
Ans:
Ans: It occurs when one process or one thread utilizes an unexpectedly high proportion of CPU.
Ans: In the Solaris environment, we need to take pstack and prstack and see what the threads are doing. In Windows, we need to use pslist and process explorer.
Ans:
Ans: Members of the Cluster communicate over the Cluster Multicast IP and Port by sending periodic heartbeat messages.
Ans:
Tuning JVM Parameters:
If you have a single processor, a single-thread machine then you should use the serial collector (default for some configurations, can be enabled explicitly for with -XX:+UseSerialGC). For multiprocessor machines where your workload is basically CPU bound, use the parallel collector. This is enabled by default if you use the -server flag, or you can enable it explicitly with -XX:+UseParallelGC. If you’d rather keep the GC pauses shorter at the expense of using more total CPU time for GC, and you have more than one CPU, you can use the concurrent collector (-XX:+UseConcMarkSweepGC). Note that the concurrent collector tends to require more RAM allocated to the JVM than the serial or parallel collectors for a given workload because some memory fragmentation can occur.
| Checkout Our Blog on WebLogic Tutorial |
Ans: It can be categorized into 4 parts. a. Application Tuning. jsp precompilation, ejb pool size cache...
Setting the TCP IP parameter. tcp_time_wait_interval tcp_conn_req_max_q
tune work manager, tune chuck size and chunk pool size, using performance packs, connection backlog buffering.
tuning gc strategy, monitoring garbage collection.
Ans:
Development Mode:
Production Mode:
Ans:
Ans:
Note: All of these protocols are, by default, multiplexed over the same connection to the server’s address and port. So you can access a web page hosted by the server using a URL such as http://host:port/page.jsp. An external client can set up an initial JNDI context to a server using the URL t3://host: port/. All that has changed is the protocol over which the client must communicate with the server.
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