java - Kafka: If the message retention policy is set to 2 days, then a message can be consumed within two days of being published. It will then be discarded to free up space.

Does this sentence mean that the message is discarded after two days to free up space, or does it mean that th...

From [Javadiscussion group] 2017-05-17 10:05:57 0  1  740

java - How to determine whether the value in a custom annotation is correct?

{code...}

From [Javadiscussion group] 2017-05-17 10:05:56 0  1  522

java - Simulate request and get return data

http://www.newrank.cn/public/... How to simulate a search request to get the returned json data. No data is re...

From [Javadiscussion group] 2017-05-17 10:05:51 0  2  585

java - swap function

In the following code, the effect of exchanging two objects is not achieved. The output result is 3:4. Logical...

From [Javadiscussion group] 2017-05-17 10:05:49 0  1  725

java - Spring boot error when starting?

{code...} I connected to MySQL and changed the pom {code...} Then the following is the {code...} of the applic...

From [Javadiscussion group] 2017-05-17 10:05:47 0  5  3579

java - For the swap function in the Collections class, why does the source code need to define a new final List variable l to point to the incoming list?

The source code of JDK1.7 is as follows: {Code...} What is the meaning of the sentence final List l = list? Wo...

From [Javadiscussion group] 2017-05-17 10:05:33 0  1  800

Garbage Collection - How to manually collect objects in java

Let’s start with the code. My goal is to make data disappear completely {code...} I know Java’s garbage collec...

From [Javadiscussion group] 2017-05-17 10:05:31 0  5  1063

javascript - Technical issues regarding WeChat scan

Now I know through understanding that the WeChat QR code contains a uid, and the client scans the QR code to g...

From [Javadiscussion group] 2017-05-17 10:05:28 0  1  841

c3p0 connection pool configuration issue - c3p0 connection pool configuration issue

信息: Illegal access: this web application instance has been stopped already. Could not load com.mchange.v2.c3p0...

From [Javadiscussion group] 2017-05-17 10:05:27 0  2  1052

How does a dubbo consumer subscribe to a provider's services?

After I write the service provider program, how do service consumers subscribe to their services from the regi...

From [Javadiscussion group] 2017-05-17 10:05:25 0  4  725

java - database bug getsession

The following logs are all INFO | SocketReader | c.s.b.sessions.DefaultSessionManager | Session removed: This ...

From [Javadiscussion group] 2017-05-17 10:05:19 0  1  717

java - builder mode What should I do if I want to set after building?

In Java's builder mode, after building an object, how do you set it?

From [Javadiscussion group] 2017-05-17 10:05:15 0  2  1372

How can a user add save to cart without logging in?

Encountering this situation: Some users find it troublesome and require to add the purchased goods to the shop...

From [Javadiscussion group] 2017-05-17 10:05:11 0  5  1032

How to send json data to kafka using Java

I only see some news about Java producing STRING type on the Internet. According to Java's producer class, you...

From [Javadiscussion group] 2017-05-17 10:05:08 0  1  1239

java - springboot returns wrong time

Configure the time zone according to what is said on the Internet. I have tried both upper and lower case. The...

From [Javadiscussion group] 2017-05-17 10:05:06 0  1  785