java.net.URL can't young gc

[shihu19860215]

I have a very simple project .
It jush have one controller, use org.springframework.web.client.RestTemplate.postForObject to get info.
But head is bigger and bigger, old gen is bigger and bigger。

[wilkinsona]

It sounds like you have a memory leak. We're not aware of one in RestTemplate (which is part of Spring Framework rather than Spring Boot) but it could also be in your application's code or in the underlying HTTP client that you are using.

You should be able to identify the source of the leak using a profiler or heap dump analyser. For example, here's a tutorial on heapdump analysis with Eclipse's memory analyser tool. If this analysis reveals that the problem is in Spring Boot, please comment again explaining why and we can re-open this issue and take another look.

[shihu19860215]

old gen max 1G, if full gc , old gen 100m .
It can be full gc, but can't be young gc。
I dump heap.
char[] have 444k+ .
one kind of char[] has 100k-200k
it is be reference by java.net.URL.
watch 'jmap -histo 20213 |grep java.net.URL' and gc info
young gc can destroy part java.net.URL，but it is bigger and bigger.

[shihu19860215]

springboot versoin updated.from 1.5.4 to 2.1.11.
but it still exists

[philwebb]

@shihu19860215 I'm afraid the additional information doesn't help much. It's not clear if you've identified a memory leak in Spring Boot, Spring Framework, A third-party library or your own code. Are you able to recreate the problem in a sample application that you can share?

[shihu19860215]

my project git url:https://github.com/shihu19860215/qding-hk-rest-patrol.git
I dump heap. if you need,please left mail.

[wilkinsona]

Thanks for the link to your app. How can we use it to reproduce the problem?

[shihu19860215]

my problem is online with other project.
it has many different request online.
I don't know how to reproduce offline.
but I have dump the heap file.
I can email to you.
it has quite detailed for java object.
please left you email。

[wilkinsona]

My email is awilkinson at pivotal dot io.

[shihu19860215]

the email has bee sent.please check.

[wilkinsona]

I haven't received it, unfortunately. I've checked my junk mail too.

[shihu19860215]

is this email？