Recent questions tagged Java

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java - Why does the Streams API need a hint for generic type in this case?

The following fails to compile: @NotNull String defaultFormatter(@Nullable Object value) { if (value instanceof Collection) ... is this needed? 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 - Tools to view/solve Windows XP memory fragmentation

We have a java program that requires a large amount of heap space - we start it with (among other command ... not currently a viable option. 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 - Getting all annotated controllers with @Controller

Is there a way to get a list of all Controllers, which were annotated with @Controller? I would like to use them like: ... ) { ... } } 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 - Launch4j, NSIS, and duplicate pinned Windows 7 taskbar icons

I'm having a problem wherein when I pin a taskbar icon in Windows 7 for my application, clicking the icon ... was in fact being set properly. 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 - Regular expression to extract SQL query

Is there a regex which extracts SQL queries from a string? I'm NOT interested to validate any SQL syntax, ... command } Thanks in advance! 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 - Assured 6 digit random number

I have to Generate a 6 digit Random Number. The below is the Code that I have done so far. It works ... 100000 + ran.nextInt(999999)).toString 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 - ARCore – How to place/create objects on surfaces like walls without any Feature Points?

For example: I am interested in placing 2D images on a vertical plane (like: white or single solid ... ideas or workaround much appreciated. 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 - postgresql thread safety for temporary tables

This the syntax I use for creating a temporary table: create temp table tmpTable (id bigint not null, primary ... local per thread? Thanks Netta 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 - Counting how many times my Android app has been opened

I am developing an android app and I want to know how many times it has been opened. Is there a way to do 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 - WebDriver.getWindowHandle() method

I'm new to Selenium learning. WebDriver.getWindowHandle() documentation is not very clear to me and the example is ... is not different than h1 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 - Setting catalina.policy to allow file access by servlets

We have a locally-developed triple store based on b-trees which I want to use for persistent storage in ... would be gratefully received. 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 - Simulated Annealing TSP

I'm looking to implement the simulated annealing algorithm in Java to find an optimal route for the Travelling Salesman ... { doBF(); } } 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 enable Spring Security POST redirect after log in with CSRF?

I'm using Spring Security 3.2 with CSRF. My configuration includes this: <csrf /> <form-login default- ... being saved in the requestCache. 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 - Hibernate/MySQL Connection Timeout

I wrote a server-side application that powers a website and multiple mobile clients. I used Hibernate for data ... could I be doing wrong? 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 jstl-api and jstl-impl

I'm a beginner in Java EE technologies. I wonder what the difference is between the jstl-api jar ... there are other implementations available? 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 - Why is an implicit narrowing conversion allowed from int to byte but not from long to int?

Consider the below code snippet: // automatic casting works for int to byte conversion as integer literal 127 // is ... value is out of range. 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 - Jackson custom annotation for custom NULL value serialization

According to this answer: https://stackoverflow.com/a/43342675/5810648 I wrote such serializer: public class ... from CreateContextual method. 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 - HikariCP auto reconnect

I use jpa+hibernate+hikariCP. Today I got connection closed error. I setted connectionTimeout and ideleTimeout properties( ... v5.2.8.Final 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 - SpringBootApplication exclude when ComponentScanning other @SpringBootApplications

I'm having some difficulty preventing Spring Boot from auto configuring some classes (in this example: SolrAutoConfiguration ... to a solution. 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 read meta data from Manifest file

I'm trying to extract information from my manifest file to display in one of the methods in my ... Specification or Implementation properties. 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 Jersey project (Rest web service) to tomcat

I'm try to follow this guide: tutorial but when I execute on the web browser it returns an error: ... my configuration project: Any suggest? 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 - android eclipse button OnClick event

I have 2 files: main_activity.xml and home.xml. I made a button in main_activity.xml Here is the code ... directory or between code snippets. 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 - Get a gregorian date from Hijri date strings

I would like to get a gregorian date from the Hijri date indexs. e.g getDate(1436, "SHawwal", 18) This ... How could I do the conversion ? See Question&Answers more detail:os...

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

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423 views

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java - How to change the textcolor of the JavaDoc view in Eclipse

I sometimes use the JavaDoc-view in Eclipse. By default it has a black background and a white font. I'd really ... can I change the font-color? 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 remove a row from the Cell Table

At first I used the Grid. After creating a new version of the GWT, I want to replace the Grid on the CellTable. See Question&Answers more detail:os...

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

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272 views

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java - Why am I getting a NoClassDefFoundError on HttpServletRequest that is pointing to ServletFileUpload?

I recently started using JMeter to load test my webapp, locally on my pc. I have a jsp page for uploading images. ... I've been using JMeter... See Question&Answers more detail:os...

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

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322 views

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java - How to get the value using getElementsByTagName

How to get the value of the tag name using getElementsByTagName. My Xml file is <parent> <method>name</ ... ("method").toString(); 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 get Filename/File Contents as key/value input for MAP when running a Hadoop MapReduce Job?

I am creating a program to analyze PDF, DOC and DOCX files. These files are stored in HDFS. When I start ... types look? Thanks in advance! See Question&Answers more detail:os...

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

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