Recent questions tagged Java

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java - Listagg function and ORA-01489: result of string concatenation is too long

When i run the following query: Select tm.product_id, listagg(tm.book_id || '(' || tm.score || ')',',') ... i.e. i am aggregating two columns). 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 - Set the maven local repository location in a pom.xml file?

It's possible to set the maven local repository in settings.xml: <localRepository>${user.home}/.m2/repository</ ... default, ~/.m2/repository). 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 - Making DateFormat Threadsafe. What to use, synchronized or Thread local

I want to make following code thread safe. What is the best way to achieve it? private static final DateFormat ... (new Date(timestamp)); } 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 - When using Android file provider, files don't have correct permissions despite FLAG_GRANT_WRITE_URI_PERMISSION being flagged in intent

I'm trying to load documents from files in my app using Microsoft Word and PDF viewers and I'm using a ... . Where am I going 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 - How to publish source into local maven repository with Gradle?

I am developing two related project. One of which is "helper" one and another is "main" one. I am ... plugin, staying only with Gradle? 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 - file.lastModified() is never what was set with file.setLastModified()

I do have a problem with millis set and read on Android 2.3.4 on a Nexus One. This is the code: File ... find it. Many thanks in advance. HJW 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 JMockit to mock autowired interface implementations

We are writing JUnit tests for a class that uses Spring autowiring to inject a dependency which is some ... create a mock someInterface? 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 - Heroku- Web process failed to bind to $PORT within 90 seconds of launch. TooTallNate Websockets

I'm using a tootallnate websockets server listening for connections from a website. How do I make a connection to ... /dependency/* v1.a1.server 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 check intersection between a line and a rectangle?

The title says it all, Ive been searching around and couldnt find anything that was straight and to the ... for an intersection (collision)? 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 call setter in chain of Stream

How can I call the setter in chain of Stream without using forEach()? List<Foo> newFoos = foos.stream() ... .collect(Collectors.toList()); 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 - a field name "ClassName" is being inserted into mongodb by morphia

I'm pretty new to mongodb and morphia, after starting using it, I realize that there is a extra part in ... there anyway to get around it? 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 my System.nanoTime() broken?

Myself and another developer on my time recently moved from a Core 2 Duo machine at work to a new Core 2 ... the corporate desktop build team? 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 - HashMap.containsValue - What's the point?

I've got a HashMap and I need to fetch an item by its integer value. I notice there's a containsValue() ... I missing the point completely? ;-) 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 hashcode for a unique ID

I am working in a java-based system where I need to set an id for certain elements in the visual display. One ... as to what the math says. 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 override jetty.xml with jetty.port

I'm using maven-jetty-plugin and trying to override my jetty.xml setting with the -Djetty.port=8090 but it's ... the jetty.xml. Did not work 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 - Reference to the final field from lambda expression

Recently I've found a subtle difference between anonymous class and lambda expression: public class FinalTest { ... there's such difference? 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 - Comparing arrays that have same elements in different order

I wrote below code to compare to arrays that have same elements but in diff order. Integer arr1[] = {1,4,6, ... .compareArrays(arr1, arr2)); } } 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 - Split a String based on regex

I have a string that needs to be split based on the occurrence of a ","(comma), but need to ignore any occurrence ... 1NF), (106,A01), AAA, AX3 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 - Try-catch: is this acceptable practice?

We have received Java code from a software supplier. It contains a lot of try-catch blocks with nothing in ... this bogus try-catch business. 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 - Virtual functions in constructors, why do languages differ?

In C++ when a virtual function is called from within a constructor it doesn't behave like a virtual function. ... think is the correct choice? See Question&Answers more detail:os...

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

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387 views

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java - Deserialize to an ImmutableMap with GSON

I'd like to use GSON to derialize: "starterItems": { "Appeltaart": 3, "Soap_50": 3 } ...into a Guava ImmutableMap ... .Map Can I do what I want? 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 I can set primitive types to null in ternary operations

I always thought that primitive types in Java cannot be null, as it is a compile time error if i attempt ... doesn't fetch nonsense like 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 - Setting heap size in IntelliJ IDEA correctly

I have this peculiar problem with running a Processing application in IntelliJ IDEA. I want to save a large image and to ... ("final step"); } } 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 ResultSetMetaData from Entity Manager?

Is there a way to get the MetaData of the result returned by executing a nativeQuery on an Entity Manager in JPA? 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 - Formatting Floating Point Numbers

I have a variable of type double, I need to print it in upto 3 decimals of precision but it ... (false); 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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308 views

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java - How to handle special characters in url as parameter values?

Can anyone suggest how to handle below url as values of parameter of strLocation is haveing special charecters ? ... )_+&async=true&newAccID=112 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 - Slow SecureRandom initialization

Suppose you do simple thing: public class Main { public static void main(String[] args) { long started = ... and may become frustrating... 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 use annotation validation in Spring with error message gotten from properties file?

I'm a Spring newbie. I set up validation in my domain class like this: public class Worker { @NotNull( ... question someone has done that. See Question&Answers more detail:os...

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

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