Recent questions tagged java

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java - Should 'Comparable<T>' be a 'Functional interface'?

The definition of a functional interface is "A functional interface is an interface that has just one abstract method ( ... compareTo(T t); } 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 Request Filter only on certain URI

I am trying to do some validation on requests coming into my service using the ContainerRequestFilter. Everything is ... kind of behaviour :) 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 add,set and get Header in request of HttpClient?

In my application I need to set the header in the request and I need to print the header value in the console... ... } } } Thanks in advance... 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 - Replace @SequenceGenerator since its deprecated

I have a problem with @SequenceGenerator: @SequenceGenerator(name="pk_user_id", sequenceName="seq_user_id", allocationSize= ... any solution. 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 - Accessing private instance variables of parent from child class?

Let's say we have a class foo which has a private instance variable bar. Now let us have another class, baz, ... working in Java, by the way. 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 - Break statement inside two while loops

Let's say I have this: while (a) { while (b) { if (b == 10) { break; } } } Question: Will the ... loops or only from the inner one? Thank you. 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 - JPA 2 Criteria Fetch Path Navigation

With JPA 2 Criteria Join method I can do the following: //Join Example (default inner join) ... /querycriteria.html#querycriteria-from-fetch 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 - Mongodb avoid duplicate entries

I am newbie to mongodb. May I know how to avoid duplicate entries. In relational tables, we use primary key ... it in Mongodb using java? 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 programmatically Edittext Cursor Color in android?

In android we can change the cursor color via: android:textCursorDrawable="@drawable/black_color_cursor". How can we do ... (R.color.black)); 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 - Finding the nearest common superclass (or superinterface) of a collection of classes

Given a collection of classes, what's the best way to find the nearest common superclass? E.g., given the ... lead one to the answer. 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 - Intellij suddenly throwing ClassNotFoundException

I'm at a complete loss here. I have a project on an external hard drive called LenseProject. Inside LenseProject ... SDK again, and libraries. 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 BitmapRegionDecoder code in android 2.2.2 (Froyo)?

I was reading an answer to a different question on SO, in which @RomainGuy commented that one could (please correct ... very useful to know 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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java - XPath.evaluate performance slows down (absurdly) over multiple calls

I am trying to use the javax.xml.xpath package to run XPath expressions on a document with multiple namespaces, and ... I can do about 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 - hibernate session.save() does not reflect in database

According to my understanding in hibernate (please confirm) 1- You have to session.close() if you get it by ... a basic thing. Please clarify. 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 - Does closing the inputstream of a socket also close the socket connection?

In Java API, Socket socket = serverSocket.accept(); BufferedReader fromSocket = new BufferedReader(new InputStreamReader ... the socket itself? 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 - Jar hell: how to use a classloader to replace one jar library version with another at runtime

I'm still relatively new to Java, so please bear with me. My issue is that my Java application depends on ... any help on 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 - Lombok 1.18.0 and Jackson 2.9.6 not working together

The deserialization is failing after the update. I updated my micro-service from Spring 1.5.10.RELEASE to Spring 2.0.3 ... ; line: 1, column: 2] 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 read Javadoc comments by reflection?

I need to know how to read Javadoc comments at run-time (probably by reflection?) Say I have the ... this javadoc comments at runtime. 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 - "Found: bit, expected: boolean" after Hibernate 4 upgrade

I'm trying to upgrade from Hibernate 3.6.5 to 4.0 (and from Spring 3.0.5 to 3.1 which is required ... at least it worked fine with Hibernate 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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java - How to find the index of an element in a TreeSet?

I'm using a TreeSet<Integer> and I'd quite simply like to find the index of a number in the set. ... without something like a search function.) 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 - Byte array to String and back.. issues with -127

In the following: scala> (new String(Array[Byte](1, 2, 3, -1, -2, -127))).getBytes res12: Array[Byte] = Array(1, 2, ... b:-2; c:-2 b:-127; c:63 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 - Properties file with a list as the value for an individual key

For my program I want to read a key from a properties file and an associated List of values for the key. Recently ... should be a way. Any help? See Question&Answers more detail:os...

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

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254 views

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java - Spring/json: Convert a typed collection like List<MyPojo>

I'm trying to marshal a list: List<Pojo> objects via the Spring Rest Template. I can pass ... in their HttpMessageConverter interface. 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 - HttpServletRequestWrapper, example implementation for setReadListener / isFinished / isReady?

I am trying to adapt a HttpServletRequestWrapper (see How to read InputStream multiple times) to be able te read ... be implemented. Any hints? 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 of Spring Bean Initialization

I have multiple context files. Requirement is: one particular Bean (which makes some configuration changes) to be ... we have better options? See Question&Answers more detail:os...

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

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243 views

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java - Default threads like, DestroyJavaVM, Reference Handler, Signal Dispatcher

Working on a profiler of my own, I would like to explain what I see. There are some default threads which ... exactly what these threads 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 - Jersey 2.0 equivalent to POJOMappingFeature

I have some experience using Jersey < 2.0. Now I am trying to build a war application to provide a JSON ... Can anyone give me a hint? 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 read several resource files with the same name from different JARs?

If there are two JAR files in the classpath, both containing a resource named "config.properties" in its root. Is ... this is possible at all. See Question&Answers more detail:os...

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

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