Recent questions tagged java

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java - Why is there a problem with a non-static variable being read from main?

String name = "Marcus"; static String s_name = "Peter"; public static void main(String[] args) { System.out. ... to the non-static field name See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Getting error for generic interface: The interface Observer cannot be implemented more than once with different arguments:

I am getting this error in Eclipse while writing a GWT app The interface Observer cannot be implemented more than ... for every possible event? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How do I check if the caps lock key is pressed?

Alright, before this gets flagged as a possible duplicate, I've already tried the following code: Toolkit. ... off no matter what) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How can I make Robot type a `:`?

I want to type : using Java Robot. However, I'm getting an IllegalArgumentException. My code is: robot.keyPress( ... can I solve this problem? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Self bound generic type with fluent interface and inheritance

I am using a fluent interface with inheritance. I declared the base class Constructor protected so you cant create a Foo ... of the type Foo<T> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to run multiple instances of jetty with maven

So, what I want to do is configure maven plugin jetty to run multiple - in my case two - instances ... the last profile mentioned was started. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Determine size of HTTP Response?

Is there a way to determine the size of the HTTPServletResponse content? I read this get-size-of-http-response- ... written instead of void... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - JSPs not displaying objects from model in Spring

I have what should be an easy issue to solve, but I'm having no luck. In my servlet-servlet.xml file, ... obvious here. Any ideas? Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Using Tomcat, @WebFilter doesn't work with <filter-mapping> inside web.xml

Here's a working web.xml: <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://java.sun.com/xml ... Tomcat (7.0.14). Glassfish is fine. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - NullPointerException when trying to run .jar file

I have just started learning java, and know only a small amount of code, however this is still a simple program ... ? Thank you in advance Sam See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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621 views

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java - How to dynamically add JLabels to JPanel?

I'm having a problem with this. I have a JPanel and normally I would create a JLabel like this: JLabel ... stringName I get from a JTextField. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - invalid END header (bad central directory size) zipException

I try to run an very simple RESTful apache-camel project with jetty. I have followed the instructions from ... .java:135) at org.eclipse.jetty.webapp.MetaInfConfiguration.pr...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How can I get the Caps Lock state, and set it to on, if it isn't already?

I would like a specific example on how to turn caps lock on if it is off. I know how to toggle the key, ... if I have a certain starting state.) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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671 views

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java - IllegalArgumentException: Bound must be positive

I get an error saying that my bound must be positive. Here is the line I get it on: inv.setItem(i, items.get( ... (Unknown Source) [?:1.8.0_51] See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Why the NPE using static method of DatatypeConverter?

I have stared at this short code too long, and cannot for the life of me see how it can throw a ... Both JREs fail with that NPE. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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186 views

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java - Changing the default encoding for String(byte[])

Is there a way to change the encoding used by the String(byte[]) constructor ? In my own code I use String( ... .encoding but it does not work. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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173 views

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java - How to read XLSX file of size >40MB

I am using XSSF of apache-POI to read the XLSX file. I was getting an error java.lang.OutOfMemoryError: Java ... to read large XLSX files. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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304 views

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java - Extracting zipped file from ResourceStream throws error "Invalid stored block lengths"

I am trying to extract a ZIP file from my current JAR using: InputStream resource = getClass().getClassLoader( ... anything related to my issue. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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499 views

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java - Converting 32-bit binary string with Integer.parseInt fails

Why does this part of code fail: Integer.parseInt("11000000000000000000000000000000",2); Exception in thread "main" java. ... . Why is that so? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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221 views

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java - Ensure Module Is Loaded Only Once In Guice

Having to deal with Guice, I wonder how I should handle dependencies in terms of modules. In Guice ... configure objects being contributed). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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190 views

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java - Why does post-increment work on wrapper classes

I was doing a review of some code and came across an instance of someone post-incrementing a member variable ... temp1; before the last line See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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208 views

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java - Context wants FLAG_ACTIVITY_NEW_TASK but I've already set that flag

I've created a common re-usable class for the company I work for to create some common interface elements. ... the intent in the onClick action See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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94 views

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java - Why is my context in my Fragment null?

I have got a question regarding the usage of context in a fragment. My problem is that I always get a ... a NullPointerException. Why is that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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353 views

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java - ProcessBuilder adds extra quotes to command line

I need to build the following command using ProcessBuilder: "C:Program FilesUSBDeviewUSBDeview.exe" /enable "My USB Device" ... how to do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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191 views

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java - What is LogCat in Eclipse?

What does LogCat do in Eclipse? How do I use it? I have never used the log cat before in Eclipse, so I don't understand. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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337 views

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java - Application property "server.servlet.session.timeout" is not working in Spring Boot project

According to the documentation of Spring Boot, session timeout can be configured by setting server.servlet.session. ... to get expected result? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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105 views

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java - Returning in a static initializer

This isn't valid code: public class MyClass { private static boolean yesNo = false; static { if (yesNo) { ... to end constructing there. Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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516 views

1 answer

java - Spring Boot Hibernate 5 Ignoring @Table and @Column

This is driving me mad. I'm implementing Spring Social and it requires you to have a database table named ... instead of the standard one. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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