Recent questions tagged java

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java - Out of memory error when putting large JSON (InputStream) to String

I receive gziped JSON from web service and then i unzip it (size of unziped JSON is 3.2MB). I need to transform ... 288MB Ram. What shall i do? 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 open packages and require dependencies on test scope modules only for JUnit testing

I'm migrating a jar project from java 10 using classpath to java 11 using the java 9 jigsaw modules. There ... to ask. Thanks in Advance Kevin 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 - Interned strings not in permgen?

I've run the jmap -heap command on our running Java application and here's what I got: C:Program FilesJavajdk1 ... not stored in the Permgen? 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 exclude a direct dependency of a Maven Plugin

I want to exclude a direct dependency of a Maven plugin and the approach described in this answer does not work (as ... ]", which was my goal.) 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 - Maven build and maven-failsafe-plugin - The forked VM terminated without properly saying goodbye

I use Docker and https://github.com/fabric8io/docker-maven-plugin for my integration tests. On my Windows ... .execute(AbstractSurefireMojo.java:832) at org.apache.maven.plugin...

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

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java - Memory requirements of an Object reference on a 64 bit JVM

A reference to an Object on a 32 bit JVM (at least on Hotspot) takes up 4 bytes. Does the 64 bit ... comprised of references to other objects)? 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 - JDK8 CompletableFuture.supplyAsync how to deal with interruptedException

CompletableFuture.supplyAsync( () -> { transporter.write(req); //here take the value from a blocking queue,will ... work. Anyone have the idea? 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 4 @OneToMany List<String>

For a @OneToMany relationship do I have to map to Objects ? I have the following example @Entity @Table(name=" ... ID) ON DELETE CASCADE ); 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 - Order-independent Hash Algorithm

I am currently working on a collection library for my custom programming language. I already have several data types ... return the same value? 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: give a webview rounded corners?

I'm trying to give my webView rounded corners. Here is my code: rounded_webview.xml: <?xml version="1.0" ... work! Corners are not rounded... 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 decode encoded special XML characters in a string?

I was given a string like example.com/test?region=us&lang=en&jurisdiction=us How can I write the java ... method to decode them? 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 - JDK8: unable to parse LocalTime

I managed to parse a String to a LocalDate object: DateTimeFormatter f1=DateTimeFormatter.ofPattern("dd MM yyyy"); ... What am I 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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369 views

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java - Mockito mock all methods call and return

I have a problem when writing unit testing with mock. There is a object which I need to mock have a lot ... the useless "field1" to "field20" See Question&Answers more detail:os...

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

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525 views

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java - MalformedByteSequenceException: Invalid byte 2 of 2-byte UTF-8 sequence

I have a xml file which contains arabic characters.When i try to parse a file,it arise the Exception, ... Any suggestion should be appreciable. 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 - I am unable to add an element to a list? UnsupportedOperationException

This one list object is biting me in the butt.. Any time I try to add an element to it, it produces ... anything on Google that's worthwhile. See Question&Answers more detail:os...

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

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313 views

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java - Vaadin Grid vs Table

What is the difference between the Grid and Table components in Vaadin 7? Which should I use, and when? 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 - javax.mail.AuthenticationFailedException: failed to connect, no password specified?

This program attempts to send e-mail but throws a run time exception: javax.mail.AuthenticationFailedException: ... it not authenticating? See Question&Answers more detail:os...

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

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246 views

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java - Finding Log4J log file

I'm working on a project that uses Log4J via Commons. I'm trying to find the path to the log file, ... the Logger. Anyone ever attempted 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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275 views

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java - Android Eclipse Error executing aapt: return code 139

I have an Android application project that suddenly stopped to work. There is apparently no error, but when I try to ... / Am I the only one? See Question&Answers more detail:os...

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

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283 views

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java - Android Development: How To Use onKeyUp?

I'm new to Android development and I can't seem to find a good guide on how to use an onKeyUp listener. ... . Could someone please show me how? See Question&Answers more detail:os...

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

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245 views

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java - Synthetic accessor method warning

I've made some new warning settings in eclipse. With these new settings I'm facing a strange warning. After ... gives me the same warning. 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 - duplicate class

Confused as to why I get duplicate class error for the following code? /* * To change this template, choose ... red with duplicate class error. See Question&Answers more detail:os...

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

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691 views

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java - How do I overwrite a log file in log4j?

I have a log file that has the following appender added to it : logger.addAppender(new FileAppender(new PatternLayout( ... the file each time ? See Question&Answers more detail:os...

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

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409 views

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java - How to use and set appropriately concurrency level for ConcurrentHashMap?

I am working with around 1000 elements in concurrenthashmap . Default concurrency level is 16 . can anyone help ... Need to set this efficiently See Question&Answers more detail:os...

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

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255 views

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java - Postgresql, JDBC, and streaming BLOBs

I am trying to retrieve a blob from a postgres database using the jdbc drivers. It is too big to have ... streaming large blobs as a download. See Question&Answers more detail:os...

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

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363 views

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java - File based h2 persisted but not loaded in Spring Boot

I made a small application based on Spring Boot: spring-boot-starter-web spring-boot-starter-data-jpa The application ... message = message; } } See Question&Answers more detail:os...

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

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213 views

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java - How to print two dimensional array of strings as String

I know how to do the toString method for one dimensional arrays of strings, but how do I print a two dimensional ... can I print a 2D array? See Question&Answers more detail:os...

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

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437 views

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java - @Basic(fetch = FetchType.LAZY) does not work?

I use JPA (Hibernate) with Spring. When i want to lazy load a Stirng property i use this syntax: @Lob @Basic( ... work. Please help me. Khosro. See Question&Answers more detail:os...

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

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