Recent questions tagged java

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java - JSP Expression Language get parameter

I am trying to get a String parameter "username" from the request with Expression Language. I've done some ... , using only expression language? 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 - short-circuiting behavior of conditional OR operator(||)

Both conditional operators && and || are short-circuited as per http://docs.oracle.com/javase/tutorial/java/ ... an example for conditional-OR. 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 - Multiple WebSecurityConfigurerAdapter in spring boot for multiple patterns

I am trying to set up multiple WebsecurityConfigurerAdapter for my project where the spring boot actuator APIs are ... known issue in Spring? 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 - Creating a TreeSet with a non-Comparable class: why a run-time exception, rather than compile-time error?

If I create an arbitrary class that does not implement Comparable, and try to use it as a treeset, it ... same not possible with generics? 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 - Error using onClickListener (Intent)

Well, I'm trying to create an intent on a "login.java" the code is : Button btEntrar = (Button) ... the compiler error output for details. 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 and declaring generic List<T>

So I'm working in Java and I want to declare a generic List. So what I'm doing so far is List<T> list = ... only takes List<T> as an argument. 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 - Get real position of a node in JavaFX

What is the best way to get the absolute position of a node in JavaFX? Imagine we have a node in a Pane ( ... node and use it in another pane. 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 maximum array size of ArrayList is Integer.MAX_VALUE - 8?

I am studying Java 8 documentation for ArrayList. I got that maximum array size is defined as Integer. ... thanks for your cooperation. 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 - API 'variant.getMergeResources()' is obsolete and has been replaced with 'variant.getMergeResourcesProvider()'

I'm experiencing very annoying warning in my projects: WARNING: API 'variant.getMergeResources()' is obsolete and has ... only a temporary fix. 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 - Adding Years to a random date from Date class

Let's say I have this: PrintStream out = System.out; Scanner in = new Scanner(System.in); out.print("Enter a ... has to be an int as well. 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 - Proper way to avoid parseInt throwing a NumberFormatException for input string: ""

When I run parseInt: Integer.parseInt(myString); it throws: NumberFormatException: For input string: "" Does this ... myString); else return 0; 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 - Proguard and error

I use this proguard file: -dontskipnonpubliclibraryclasses -dontskipnonpubliclibraryclassmembers !code/simplification/arithmetic, ... class org.apache.http.message.BasicStatusLine...

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

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java - ALLOW_UNQUOTED_FIELD_NAMES in jackon JSON library

I'm using the jackson library for serializing/deserializing to/from JSON. I need that this JSON has the ... escape this characters? 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 - InetAddress.getCanonicalHostName() returns IP instead of Hostname

I looked for how to do IP lookup in Java on Stack Overflow but the answers match what I am already ... value, bypassing the internal exception? 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 - JPanel doesn't update until resize Jframe

I subclass JPanel to overwrite paintComponent(Graphics), I want to draw an image onto jpanel in a jframe. But my image hasn ... 0, 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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java - After update to Android Studio 3.1 I'm facing this error: Could not find org.jetbrains.kotlin:kotlin-stdlib-jre8:1.2.0

After updating to Android Studio 3.1, I'm facing this error. Note: I'm using Java not Kotlin Could not ... com.android.tools:repository:26.1.0 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 pass Properties to jar from Powershell?

I've been using Powershell-1.0 for command line needs for a while, instead of cmd.exe. Unfortunately, there are ... do I miss something in Java? 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 - Adding header in response in filter?

I need to add the header in each response. I am planning to do below public class MyFilter extends ... i am using spring mvc. 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 - Retrieving other component's client ID in JSF 2.0

Does JSF 2.0 have a built-in method for finding the client ID of another component? There are about a ... caused by hard-coded ID paths. 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 - JPA: Store a list of integers in a single field

Is it possible to store a list of integers in a single field of the respective entity table with standard JPA ... private List<Integer> vals; See Question&Answers more detail:os...

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

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194 views

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java - Jackson error: no suitable constructor

I'm using Jackson to deserialize a json array into some objects. Here's my class: public class OfferContainer extends ... :29:59Z" } } ] See Question&Answers more detail:os...

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

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255 views

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java - how to get frame rate of video in android os?

I want to get frame rate of video, but i don't want to use FFMPEG,JAVACV lib. is that possible to get ... rate from video then answer here. 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 - Java8 DateTimeFormatter am/pm

I am trying to parse some dates, but the DateTimeParser seems to disagree with me on what is valid import ... error messages are not helpful. 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 dynamically change log level in SLF4j OR Log4J

Recently I encountered a situtation where Application Loglevel changes dynamically. Application Admin can set it to ... your help. -Narendra 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 - Converting a BufferedImage to another type

The most convenient method to read an image from a source (Files, InputStreams, URLs) is: ... a BufferedImage.TYPE_USHORT_565_RGB format? See Question&Answers more detail:os...

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

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339 views

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java - System.out closed? Can I reopen it?

I was helping a friend to write some Java code, who doesn't know a lot about Java. So I wrote him some ... ways to write such a helper function? 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 avoid ConcurrentModificationException when iterating over a map and changing values?

I've got a map containing some keys (Strings) and values (POJOs) I want to iterate through this map and alter ... I go, then return the copy? See Question&Answers more detail:os...

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

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263 views

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java - How to get Spring RabbitMQ to create a new Queue?

In my (limited) experience with rabbit-mq, if you create a new listener for a queue that doesn't exist yet, ... Or am I missing something else? See Question&Answers more detail:os...

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

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