Recent questions tagged java

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java - Accessing javax.smartcardio from Linux 64 bits

I'm trying to load the smartcard terminals using the javax.smartcardio API with the following code: public CardTerminal ... . Any ideas? 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 - What is the lifecycle of a HttpServlet?

Basically, how long is an instance of a servlet around for? I am kind of guessing it is session scope. ... collection to remove old instances. 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 - JavaMail smtp properties (for STARTTLS)

JavaMail specifies a bunch of properties that can be set to configure an SMTP connection. To use STARTTLS it is ... to use smtp with starttls? 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 - startScan() in WifiManager deprecated in Android P

How to get scan result from wifi for example every 3 seconds, without mWifimanager.startScan(); Google says ... .google.com/issues/112688545 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 - Writing to HDFS could only be replicated to 0 nodes instead of minReplication (=1)

I have 3 data nodes running, while running a job i am getting the following given below error , java.io. ... not sure why this is happending. 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 - Convert JSON query parameters to objects with JAX-RS

I have a JAX-RS resource, which gets its paramaters as a JSON string like this: http://some.test/aresource? ... a query param to Java 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 - JRE included with JDK vs. standalone JRE

What's the difference between the JRE included with the JDK (located inside of the jre folder) and the standalone JRE? Is there any? 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 : Downside of merge() over update()

I'm having problems with a NonUniqueObjectException thrown by Hibernate. Reading the docs, and this blog post, I ... merge() over update()? 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 - jersey - StreamingOutput as Response entity

I had implemented streaming output in my Jersey Resource class. @GET @Path("xxxxx") @Produces(BulkConstants.TEXT_XML_MEDIA_TYPE}) ... )+" ms"); 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 - Kafka Connect running out of heap space

After starting Kafka Connect (connect-standalone), my task fails immediately after starting with: java.lang. ... the heap space. 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 can Scala receive multiple parameters in a method definition?

Java has: public void someMethod(int ... intArray) { // question: what is the equivalent to "..." // ... number of parameters to a 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 - How to disable the default exposure of Spring Data REST repositories?

I have a project that uses spring-data-rest, and has a dependency project that only uses Spring Data. Both ... Data REST solely for the 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-Data JPA: save new entity referencing existing one

The question is basically the same as below one: JPA cascade persist and references to detached entities throws ... will always be detached. 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 - Using reflection to set an object property

I getting class by name and i need to update them with respective data and my question is how to do it with ... this.FirstName = FirstName; } } 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 - Concatenating elements in an array to a string

I'm confused a bit. I couldn't find the answer anywhere ;( I've got an String array: String[] arr = ["1", ... it in java? I'm using Eclipse IDE 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 - Difference in LinkedList, queue vs list

What is the difference when creating these two objects Queue<String> test = new LinkedList<String>(); and List< ... use one over the other? See Question&Answers more detail:os...

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

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391 views

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java - Spring Security circular bean dependency

I'm currently working on a Vaadin spring application. According to the app specifications, authentication/authorization of ... use the latest) 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 change already compiled .class file without decompile?

I want to change .class file's method. I installed JD Eclipse Decompiler and opened the .class file. ... SequenceIdentityGenerator.class); } } 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 - Using Apache POI HSSF, how can I refresh all formula cells at once?

I am filling cells of an Excel file using Apache POI, and there are a lot of formula cells in the document. However ... I'm very willing to 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 - Convert file to byte array and vice versa

I've found many ways of converting a file to a byte array and writing byte array to a file on ... File myFile = ConvertfromByteArray(bytes); 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 single field from JSON using Jackson

Given an arbitrary JSON I would like to get value of a single field contentType. How to do it with Jackson? { ... JSON field of an object (GSON) See Question&Answers more detail:os...

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

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86 views

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java - Create a BufferedImage from file and make it TYPE_INT_ARGB

I have a PNG file with transparency that is loaded and stored in a BufferedImage. I need this BufferedImage ... and make it TYPE_INT_ARGB? 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 - Could not transfer artifact (https://repo.maven.apache.org/maven2): Received fatal alert: protocol_version -> [Help 1]

I am new to Maven and trying to setup my first project in Maven but receiving the below error message when I am ... and maven version is 3.3.3 See Question&Answers more detail:os...

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

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155 views

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java - A realistic example where using BigDecimal for currency is strictly better than using double

We know that using double for currency is error-prone and not recommended. However, I'm yet to see a realistic ... I'm looking for more answers. 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 - Differences between jar and war in Spring Boot?

I'm about to build my first website in Java with Spring Framework using Spring Boot and it's much easier to build ... a jar on an online host? 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 - SpringApplication.run main method

I created a project in Eclipse using the Spring Starter project template. It automatically created an Application class file ... can I 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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109 views

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java - What is the purpose of a delegation pattern?

I was looking through the source to SensorManager in Android and found that when you register a SensorEventListener ... are around line 1054. 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 - Logger vs. System.out.println

I'm using the PMD plugin for eclipse and it gives me an error when using System.out.println() with the ... screen? Why is it better? See Question&Answers more detail:os...

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

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