Recent questions tagged Java

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java - How can I send a PNG of a QR-code in a HTTP response body (with Spark)?

I want to generate a QR-code image, convert it to PNG and return it as a HTTP response to my client. ... encode(outputStream.toByteArray()); } } 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 - Overriding Method with Exception

So here is the quote from the book: The overriding method must NOT throw checked exceptions that are new or ... was no error. Please explain. 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 parametrized Class instance

Since generics were introduced, Class is parametrized, so that List.class produces Class<List>. This is clear. ... way. Thanks for suggestions. 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 - Eclipse per project build setting

Is there a way in Eclipse to set up Project>Build Project or Project>Build Automatically in a project by project ... the order of the builds. 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 specify SQL comments through JPA annotations?

Is there any way to specify SQL comments through JPA annotations? Comments for tables and 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 - What is the difference between declaring List<Integer> vs ArrayList<Integer>?

List<Integer> mylist = new ArrayList<Integer>(); ArrayList<Integer> mylist2 = new ArrayList<Integer>(); I ... that ArrayList class implements. 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 I use GSON to parse and place into a list of objects?

I have a domain object Foo, and I want to parse some JSON such as [ {"prop": "val"}, {"prop": "val2"}, ... fromJson(json, /*what goes here ?*/); 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 an Array of Objects from Firestore

What would be the right way to query a field that is an array of maps. Currently the structure is Collection1 ... Or how does it 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 - How to catch lifecycle events with ProcessLifecycleOwner?

I am trying to (at least partially) determine when an application gets closed by the user to release some ... in your custom application 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 - Error in adding an edit text in eclipse

I'm building an Android app for a tablet. I'm trying to add an EditText in my graphical view in Eclipse but ... Log" How to fix this problem? 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 - Removing Jar Signatures in Gradle Build

We are having an issue with a war built from gradle failing to load in tomcat because of a Security ... Invalid signature file digest for 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 - JList add/remove Item

Hi I have to pick an element from a JList to another, removing it from the first The method I've ... listaTitolari.setModel(listModel); } 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 - NoClassDefFoundError Landroid/arch/lifecycle/LifecycleDispatcher

I want to try out the new lifecycle stuff from google (https://developer.android.com/arch) but getting a crash ... room:compiler:1.0.0-alpha1' 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 Parcelable bad array lengths

Parcelables. Why can't they be more easy? I'm trying to write an application which sends an ArrayList as a parcelable ... NewsItem[size]; } }; } 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 and add elements to TreeMap while iterating?

I want to write code like this - for (Map.Entry<Long, Integer> e : map.entrySet()){ map.remove(k); ... also but I got the same Exception 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 I Avoid Using Exceptions for Flow Control?

I have been assigned a project to develop a set of classes that act as an interface to a storage system. A ... , and content body (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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438 views

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java - Byte-buddy: generate classes with cyclic types

I'm trying to generate classes with a cyclic class dependency, similar to this question: Byte Buddy - Handling ... .main(AppMain.java:147) 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 - Stock JDK classes and the "null" ClassLoader?

I am trying to debug a very strange class error by looking at the ClassLoaders for some dynamically created ... null null null null null 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 - Sharing a project between Eclipse and Netbeans

Is there a way to share the same *.java files between Netbeans and Eclipse? 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 correct inject map of bean in spring context

I am using component-scan in my spring application. So in spring context I created map: <util:map id="mapByName" ... key name in map property ? 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 access an object's public fields from a Velocity template

Here is my object class: public class Address { public final String line1; public final String town; ... Velocity without adding getters? 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 - Thread.isInterrupted() returns false after thread has been terminated

Consider the following JUnit test: @Test public void testSettingInterruptFlag() throws InterruptedException { Thread ... documented anywhere? See Question&Answers more detail:os...

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

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358 views

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java - Service has leaked IntentReceiver in android

I am making an android app. I am making a service that runs in the background all the time when user checks a ... mMediaPlayer.stop(); } } }; See Question&Answers more detail:os...

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

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750 views

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java - Invalid LOC header(bad signature)

I am getting this error during my Maven build. Failed to execute goal org.apache.maven.plugins:maven-shade-plugin:2. ... does not seem to 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 - wrong ELF class: ELFCLASS32

I'm getting this error pointing to some .so file when running my application on a Solaris machine. However ... containing the file above. 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 - Dynamic addition of queues to a rabbit listener at runtime

I've got a project where we are going to have hundreds (potentially thousands) of queues in rabbit and ... via properties) declaring the queues See Question&Answers more detail:os...

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

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570 views

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java - Garbage Collection in android (Done manually)

I have a strange doubts. I know garbage collector has its own limitation. and if allocation is bad ... this link Java Performance Optimization 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 date-time manipulation library

Coming from C#, I got used to the slick interface DateTime and TimeSpan offer. With these, I can access date- ... of Date objects in Android? See Question&Answers more detail:os...

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

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