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encountered the leak Inour own demo applicationthat we ship with PLUMBR. It's a slightly modified Pet Clinic application shipped along with Spring MVC. Let us highlight some things it happen when this application was being deployed to the server. The Another typical memory leak is caused by a database driver. We encountered this memory leak in the demo program that we released with PLUMBR. It is a pet cli

later I found myself staring at the following in the/var/log/kern.log :Jun 4 07:41:59 plumbr kernel: [70667120.897649] Out of memory: Kill process 29957 (java) score 366 or sacrifice childJun 4 07:41:59 plumbr kernel: [70667120.897701] Killed process 29957 (java) total-vm:2532680kB, anon-rss:1416508kB, file-rss:0kBApparently we became victims of the Linux kernel internals. As you all know, the Linux is b

and easy; Flexible routing matching; It has a template engine that can be used to create reusable components that support freemarker,apache Velocity and mustache; Standalone spark can be run on jetty or on Tomcat. unique: A picture can be over 1000 words, but it may be more direct, used to know.Origin: Spark was initiated by the Swedish per Wendel, with very few early participants, and later more than 20 developers participated in the development.7.

routing matching;It has a template engine that can create reusable components that support freemarker,apache Velocity and mustache;The standalone spark can be run on jetty, or on Tomcat.Unique: A picture can reach 1000 words, but the screenshot may be more direct, used to know. Origin: Spark was launched by Per Wendel in Sweden, with very little initial involvement and more than 20 developers involved in the development. 7.plumbr--Memory Leak Detec

and easy; Flexible routing matching; It has a template engine that can be used to create reusable components that support freemarker,apache Velocity and mustache; Standalone spark can be run on jetty or on Tomcat. Unique: A picture can be over 1000 words, but it may be more direct, used to know.Origin: Spark was initiated by the Swedish per Wendel, with very few early participants, and later more than 20 developers participated in the development.7.

, threads in the JVM will need some space to do their work, and when there are enough threads but not so much space, it would look like this: Picture Source: Plumbr appears java.lang.OutOfMemoryError:Unable to The Create new native thread means that the Java application has reached its limit of the number of threads it can start. Cause analysis When the JVM creates a new thread to the OS request, and the OS fails to create a new native thread, it thro

analysis to help locate Java program errors. FindBugs is free. You can use a GUI or multiple IDE plug-ins such as NetBeans, IntelliJ, and Eclipse. Plumbr Plumbr is designed to solve real-time performance problems. It can perfectly detect memory leaks, inefficient garbage collection, and Java application problems such as thread locks. Using it ensures the smooth development of the project and the best perfo

Eclipse. Plumbr Plumbr is designed to solve real-time performance problems. It can perfectly detect memory leaks, inefficient garbage collection, and Java application problems such as thread locks. Using it ensures the smooth development of the project and the best performance. You only need to add the tool to your program. If you find any defects, you will be prompted. It provides all the details such as

it is deleted by the original ClassLoader, can simulate a class loader overflow Hiding aggressive code in a Finalize method makes the program performance unpredictable By adding a tricky combination to a long-running thread, it may hold something in the threadlocals that can be accessed by the thread pool to manage the application thread. I hope we have given you some raw material for thinking and some material when you want to fix someone. This will result in endless debugging. Unle

This article is part of the Java garbage Collection manual published by Plumbr . This article describes the output format of the GC log and how to interpret the GC log to extract useful information from it. With -XX:+UseSerialGC the option, we specify that the JVM use the serial garbage collector and use the following startup parameters to let the JVM print out verbose GC logs: -XX:+PrintGCDetails-XX:+PrintGCDateStamps-XX:+PrintGCTimeStampsAfter th

We have spent last couple of months stabilizing the lock detection functionality in plumbr. during this we have stumbled into pair tricky concurrency issues. attributes of the issues are unique, but one participant type of issues keeps repeatedly appearing. You might have guessed it-Misuse ofVolatileKeyword. we have detected and solved bunch of issues where the extensive usage of volatile made arbitrary parts of the application slower, extended locks

Minimum Response Time:6 MS Maximum Response time:2,058 MS throughput:1,965 Requests/second The specific case was small and synthetic, but similar improvements was achievable in the Real-world applications. Now, before you run to rewrite all your servlets to the asynchronous servlets–hold your horses for a minute. The solution works perfectly on a subset of usage cases, such as group chats notifications and auction house price alerts. You'll most likely isn't benefit in the cas

How to Improve the Performance of Java locks Two months ago, after introducing thread Deadlock Detection to Plumbr, we began to receive some questions similar to this: "Great! Now I know why the program has performance problems, but what should I do next ?" We try our best to find a solution to the problems encountered by our products, but I will share with you several common technologies in this article, these technologies include separating locks,

2017 different application serve (data from: PLUMBR)IV. Reverse proxy servers (Reverse proxy server)1. The reverse proxy is one of the proxy servers. It obtains resources from back-end servers, such as Web servers, based on client requests, and then returns those resources to the client. Unlike the forward proxy, the forward proxy acts as a medium to return the resources obtained on the Internet to the associated clients, while the reverse proxy is u

0.0 0.0 1211904.0 720900.4 524288.0 164352.2 21504.0 2579.2 27 2.969 141-8.441 11. 409 542.3 164352.0 164352.0 0.0 0.0 1211904.0 1015812.6 524288.0 164352.2 21504.0 2579.2 27 2.969 141-8.441 11.409 Given the amount of work that is equivalent in both cases, it can clean up the garbage more quickly in this pig-eating experiment when the GC does not find a long-lived object. With the first configuration, the GC is likely to run at a rate of 6 to 7 times times, while the total pause time is