Recent questions tagged JAVA

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java - How are exceptions caught and dealt with at the low (assembly) level?

I have this code - try { doSomething(); } catch (Exception e) { e.printStackTrace(); } How will this actually ... /and or handled by the jvm. 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 - Any way to boost JVM Startup Speed?

It is said that Java is 10x faster than python in terms of performance. That's what I see from benchmarks ... UDP or Linux-ICP sockets locally? 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 - Do the -Xms and -Xmx flags reserve the machine's resources?

I know that the -Xms flag of JVM process is to allow the JVM process to use a specific amount of memory to ... from using it. Is this right? 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 - What's the difference between an instance initializer and a constructor?

Just wondering about the reason of compiling code like this: class MyClass extends AnotherClass { { MySecondClass ... the object creation. 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 - Triangle Draw Method

I have trouble drawing a triangle with the draw(Graphics g) method in Java. I can draw a rectangle like so ... example for a standard triangle? See Question&Answers more detail:os...

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

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596 views

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java 8 - Is the cacerts file missing in ubuntu 15.10 and openjdk-8-jdk?

I just installed Ubuntu 15.10 and their openjdk-8-jdk (by apt-get). Now I am missing the cacerts file. ... cacerts': No such file or directory 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 - Logging Payload of POSTs to Tomcat

I've managed to enable access logging in Tomcat by editing the conf/server.xml and uncommenting the entry for ... Do I use the AccessLogValve? See Question&Answers more detail:os...

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

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424 views

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java - How to externalize application.properties in Tomcat webserver for Spring?

SpringApplication will load properties from application.properties files in the following locations and add them to ... location outside. 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 - Unclosed Character Class Error?

Here is the error: Exception in thread "main" java.util.regex.PatternSyntaxException: Unclosed character class near ... fix the code above? 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 - Installing WindowBuilder on Eclipse 4.2

I'm using Eclipse Juno 4.2, downloaded from here. On previous installs, I've been using 3.7, and I've been ... how I can go about installing 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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1.3k views

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java - JPA/Hibernate "Composite-id class does not override equals()"

I'm using JPA and getting the following warning. I've researched this, and understand why I need to override it ... more complex going on here? See Question&Answers more detail:os...

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

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184 views

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java - What is the purpose of the IsSerializable interface in GWT (regarding the RPC mechanism)

What is the purpose of the IsSerializable interface in GWT (regarding the RPC mechanism). I have never been ... interface does not work. See Question&Answers more detail:os...

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

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137 views

1 answer

java - Parsing a date with short month without dot

I have a String that represents a date in French locale : 09-oct-08 : I need to parse that String so I came up with ... ()); I get : 28-oct.-09 See Question&Answers more detail:os...

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

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304 views

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java - Making a Thread to Sleep for 30 minutes

I want to make my thread to wait for 30 minutes. Are there any problems of doing 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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580 views

1 answer

java - How to interrupt or stop currently running quartz job?

I have some tasks that are executed with the help of Java Quartz Jobs, but I need to stop some tasks by some ... in what way i should do 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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239 views

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java - Programmatic SchemaExport / SchemaUpdate with Hibernate 5 and Spring 4

With Spring 4 and Hibernate 4, I was able to use Reflection to get the Hibernate Configuration object from the ... way to get this working? See Question&Answers more detail:os...

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

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170 views

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java - Why backup related process might cause Application's onCreate is not executed?

It is common to have Application class as follow public class WeNoteApplication extends MultiDexApplication { public ... /yccheok/AutoBackup-bug See Question&Answers more detail:os...

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

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123 views

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java - Case insensitive String split() method

When I perform String test="23x34 "; String[] array=test.split("x"); //splitting using simple letter I got ... any other method that can 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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113 views

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java - How to set name to the thread?

Is there a way to set a friendly name to a thread in code? For example, I want the thread with ... was named something like 'MyImportThread'. See Question&Answers more detail:os...

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

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2.4k views

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java - W/System: A resource failed to call release

As the title says. When using the console of AndroidStudio on my app it shows: W/System: A resource failed ... Any ideas are welcome. 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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276 views

1 answer

java - What is more efficient: sorted stream or sorting a list?

Assume we have some items in a collection and we want to sort them using certain comparator, expecting result ... did not really enlighten me. See Question&Answers more detail:os...

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

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209 views

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java - Using environment variables in "VM options" and "Program arguments"

In my project configuration in IDEA, I have the following text fields: I would like to define some environment variables ... how can I fix 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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405 views

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java - Write number in excel cells using Apache POI

How can I write my full value in cell with help of poi ? i.e. if value is 1000.000 then how can I write ... but this is not right format for me. See Question&Answers more detail:os...

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

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668 views

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java - What is the simplest way to configure the indentation spacing on a Jackson ObjectMapper?

I'm really struggling with the degree of complexity I am perceiving in solving this problem. As the title says: ... there is a simpler way. See Question&Answers more detail:os...

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

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274 views

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java - How can I count the number of elements that match a predicate with Streams?

In Java7 I have this code: public int getPlayersOnline() { int count = 0; for (Player player : players) ... about improving this with lambdas? 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

1 answer

java - How to stop a running mysql query

How do I stop a running mysql query programmatically? The problem I'm facing is that a query is constructed ... cancel a running mysql-query? See Question&Answers more detail:os...

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

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463 views

1 answer

java - Converting byte array values in little endian order to short values

I have a byte array where the data in the array is actually short data. The bytes are ordered in little ... but that has a performance hit. See Question&Answers more detail:os...

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

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275 views

1 answer

java - How do you unit test a JavaFX controller with JUnit

What's the proper way of initializing the JavaFX runtime so you can unit test (with JUnit) controllers that ... / controller tests follow... See Question&Answers more detail:os...

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

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