cron4j | cron4j定时任务框架 - 基于cron4j | Cron Utils library

by IAMTJW Java Version: 2.2.6 License: LGPL-2.1

X-Ray Key Features Code Snippets Community Discussions(3)Vulnerabilities Install Support

kandi X-RAY | cron4j Summary

cron4j is a Java library typically used in Utilities, Cron Utils applications. cron4j has no bugs, it has no vulnerabilities, it has build file available, it has a Weak Copyleft License and it has high support. You can download it from GitHub.

基于cron4j 2.2.5版本源码，进行如下改造：（1）在原有分、时、天、月和周基础上添加对秒的支持（2）改造当服务器时间前后跳变时定时任务暂停执行逻辑。.

Support

Quality

Security

License

Reuse

Support

cron4j has a highly active ecosystem.

It has 13 star(s) with 6 fork(s). There are no watchers for this library.

It had no major release in the last 12 months.

cron4j has no issues reported. There are no pull requests.

It has a negative sentiment in the developer community.

The latest version of cron4j is 2.2.6

Quality

cron4j has no bugs reported.

Security

cron4j has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

cron4j is licensed under the LGPL-2.1 License. This license is Weak Copyleft.

Weak Copyleft licenses have some restrictions, but you can use them in commercial projects.

Reuse

cron4j releases are available to install and integrate.

Build file is available. You can build the component from source.

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cron4j Key Features

No Key Features are available at this moment for cron4j.

cron4j Examples and Code Snippets

No Code Snippets are available at this moment for cron4j.

Community Discussions

Trending Discussions on cron4j

JVM crash on Centos7

Start a schedule when current running schedule hasn't finished yet Cron4j

Severe exception on servlet with java.lang.NoClassDefFoundError

QUESTION

JVM crash on Centos7

Asked 2020-Jan-22 at 03:29

I am running a jetty server on centos7 and it keeps crashing with the below error

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ANSWER

Answered 2020-Jan-22 at 03:29

As one can see the issue is from libjvm.so JVM environment and not an application problem

No: the issue is most likely with libbCacheService.so, and not libjvm.so. I don't know what the origin of libbCacheService.so is, but given that google only finds this question when I search for it, I suspect that it's your application.

Besides, the same setup and code on Ubuntu works fine

That is quite often the case: an application exhibiting undefined behavior works "fine" on one system, and crashes on another.

Your first step should be building libbCacheService.so with debug info, enabling core dumps, and checking from the core that whatever libjvm.so function is invoked from JNIEnv_::GetObjectClass() is called with correct arguments.

P.S. It looks (from si_addr) that libjvm.so dereferenced a NULL pointer. Possibly because you passed a NULL pointer to it as one of the parameters.

Source https://stackoverflow.com/questions/59849540

QUESTION

Start a schedule when current running schedule hasn't finished yet Cron4j

Asked 2018-Aug-15 at 13:55

I'm using Cron4j to create backup schedules for a database. Assume that we had 2 schedules, the first started at 5.00 pm, and the second started at 5.30 pm, both at the same day. I don't know what would happend if the backup time of the first schedule was greater than 30 minutes. I assume that the second schedule would still start and could ruin the database as the first one wasn't finished and the database wasn't updated. What should i do in that case?

...

ANSWER

Answered 2018-Aug-15 at 13:08

You can create thread with custom name and put you bacup process into. And the next time you try find him by name. If he will be finded - gackup is working.

Source https://stackoverflow.com/questions/51858730

QUESTION

Severe exception on servlet with java.lang.NoClassDefFoundError

Asked 2017-Mar-08 at 09:38

I get this exception on my tomcat8 running on this java version OpenJDK Runtime Environment (build 1.8.0_121-8u121-b13-0ubuntu1.16.04.2-b13)

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ANSWER

Answered 2017-Mar-08 at 09:38

We solved the problem by removing the folders that tomcat creates in the path /tomcat8/work/Catalina/localhost.

Reading @Jared answer here Why am I getting a NoClassDefFoundError in Java?

Usually this indicates that we previously attempted to load a class from the classpath, but it failed for some reason - now we're trying to use the class again (and thus need to load it, since it failed last time), but we're not even going to try to load it, because we failed loading it earlier

and regarding the fact that the work directory of tomcat is where tomcat writes any file that it needs during run time (for more info read here tomcat8 configuration reference)

This directory will be made visible to servlets in the web application by a servlet context attribute (of type java.io.File) named javax.servlet.context.tempdir as described in the Servlet Specification

, I believe that these two things correlate with each other

Source https://stackoverflow.com/questions/42653714

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install cron4j

You can download it from GitHub.
You can use cron4j like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the cron4j component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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