Recent questions tagged java

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java - function to remove duplicate characters in a string

The following code is trying to remove any duplicate characters in a string. I'm not sure if the code is right. Can ... } str[tail] = 0; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Correct way to sign and verify signature using bouncycastle

I am using bcmail-jdk16-1.46.jar and bcprov-jdk16-1.46.jar (Bouncycastle libraries) to sign a string ... s/zs4jo1a86v8qamw/certificates.p12?dl=0 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How do I calculate the cosine similarity of two vectors?

How do I find the cosine similarity between vectors? I need to find the similarity to measure the ... smiliarity between these vectors? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Optimal number of connections in connection pool

Currently we are using 4 cpu windows box with 8gb RAM with MySQL 5.x installed on same box. We are ... AS' connection pooling mechanism) ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Example of using Android tabs with Views instead of Activities?

The Android Developers TabWidget tutorial says the following: "You can implement your tab content in one of two ways: ... clue me in. Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Does C# Monitor.Wait() suffer from spurious wakeups?

Java's Object.wait() warns against "spurious wakeups" but C#'s Monitor.wait() doesn't seem to mention it ... 't this be documented somewhere? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Running Tomcat server on two different ports

I want to to deploy a tomcat server such that it listens on two ports simultaneously (both for http protocol). ... how can we achive this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How do I add time-stamp information to Maven artifacts?

I am upgrading a large build-system to use Maven2 instead of Ant, and we have two related requirements that ... start would be helpful! Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Difference between MockMvc and RestTemplate in integration tests

Both MockMvc and RestTemplate are used for integration tests with Spring and JUnit. Question is: what's the ... , entity.getStatusCode()); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Set Logging Level in Spring Boot via Environment Variable

Should it be possible to set logging levels through environment variables alone in a Spring Boot application? I ... properties does work though. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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111 views

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java - Android Activity without ActionBar

I have different Activities in my App and in all of them I do not want the Action Bar. I cannot find ... anything. Can somebody help me please? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Evaluate list.contains string in JSTL

I need to hide an element if certain values are present in the JSP The values are stored in a List so I ... list and the values are strings. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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298 views

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java - Difference between try-finally and try-catch

What's the difference between try { fooBar(); } finally { barFoo(); } and try { fooBar(); } catch( ... the exception from the finally clause? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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127 views

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java - Converting Integer to Long

I need to get the value of a field using reflection. It so happens that I am not always sure what the datatype of ... ? I am using Java 1.6. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Spring OAuth2 - Manually creating an access token in the token store

I have a situation where I would like to create an access token myself (so not through the usual process). I ... I want to grant this token. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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229 views

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java - Does every exception have an required try-catch?

A simple question and I can't find the answer for it. Is it required to every exception in Java to use a ... and which doesn't need try-catch. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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340 views

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java - Android HttpClient - hostname in certificate didn't match <example.com> != <*.example.com>

I'm using HttpClient on Android to connect to https://someUrl.com/somePath. The problem is that the site' ... relax and accept the certificate? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to stop a thread that is running forever without any use

In the below code, i have a while(true) loop. considering a situation where there is some code in the try block ... .printStackTrace(); } } } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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242 views

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java - How to initialize in-memory HSQLDB using script via Spring

I am attempting to do unit testing of my DAO (using Spring and Hibernate). I am using HSQLDB per this ... help would be appreciated. Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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311 views

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java - Difference between @Qualifier and @Resource

I don't see any difference between two ways, @Qualifier is always used with @Autowired. @Autowired @Qualifier(" ... know the difference? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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222 views

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java - IntelliJ freezes for about 30 seconds before debugging

when i try to debug my java app the IDE freezes for about 30 seconds with the message: "Finished, saving caches ... MacBookPro 2015 and JDK 1.8 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Refresh and fetch an entity after save (JPA/Spring Data/Hibernate)

I've these two simple entities Something and Property. The Something entity has a many-to-one relationship ... new refreshed persisted entity. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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134 views

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java - Maven docker cache dependencies

I'm trying to use docker to automate maven builds. The project I want to build takes nearly 20 minutes to ... part of the resulting image. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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131 views

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java - Why use hexadecimal constants?

Sometimes I see Integer constants defined in hexadecimal, instead of decimal numbers. This is a small part I took from ... 's job to change it. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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190 views

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java - Is it possible from Spring to inject the result of calling a method on a ref bean?

Is it possible from Spring to inject the result of calling a method on a ref bean? I'm trying to refactor ... like this is possible in Spring! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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247 views

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java - Handler is abstract ,cannot be instantiated

I am trying to use a Handler in my app. However, when I instantiate it like this: Handler handler = ... find symbol method postDelayed(,int) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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126 views

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java - Maven package works but Intellij's build fails

I have a JDK 1.7 project with a maven dependency to a local jar in my maven repo. I'm unable to build ... install' did the trick. Please help. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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118 views

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java - How to check if element exists using a lambda expression?

Specifically, I have TabPane, and I would like to know if there is element with specific ID in it. So, I would like ... ) { idExists = true; } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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