There are several ways to create project. It can be done by IDE default wizard or generate via spring initializer. Even these are convenient to us to setup project, but for organization it might has […]
Whois is a protocol to look up domain name information. It can be done in using socket connect to whois server and send request. This example will show how to use Apache common.net to get […]
In some business case to white list requester in private IP in code level. There is no library to do so and we need to do it by own. In this example, it will use […]
When passing data to LogStash, it will show escape character in log message. But sometime, it cannot update logstash pipeline to replace specific character so need to implement in code level.
For Removing empty item in list, it can be be done directly. When using method removeIf(), it will throw UnSupportOperationException . It caused by collection items cannot be removed.
Checksum ensure the integrity of file. In AWS S3, it also using eTag to do similar things. It create MD5 value and store in eTag. However, it is not a real checksum for s3 object […]
Opentracing is one of the open protocol for distribute tracing between microservices. With APM, it helps to identify service dependency and target bottom-neck during performance tuning. Even it merged to OpenTelmetry in recent years but […]
Application Performance Monitoring is one of the method to ensure application’s availability and status. However, most of them only can check the platform status (e.g. CPU usage / Thread / Memory / etc), some organization […]
It caused by Eclipse default server setting on JMX.
發生這個問題時, 主要是因為object 中有多個@JsonManagedReference 找到, 因此會令serialize 時不能正常找到相對應的class resolve.
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