Recent questions tagged java

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java - SQLException: executeQuery method can not be used for update

I am trying to insert user information taken from a registration form into Derby DB using a java servlet class. ... about? Thanks in advance! 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 - When is generic return value of function casted after type erasure?

This question was inducted by this StackOverflow question about unsafe casts: Java Casting method without knowing ... unsafeIdentity("foo"); 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 - Open Local Html File in Webview - Android

I have a saved a file in the root folder and am trying to open it in a webview. This is my code for ... found error. Any insight is 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 - Redirect System.out and System.err

I have some legacy code (or rather some code we don't control but we have to use) that writes a lot of ... there a simple way to achieve 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 - Can JSF 2.0 be used with Websphere application server version 7.x

Can JSF 2.0 be used with WebSphere Application Server version 7.x? If so, how? 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 - TOMCAT_OPTS, environment variable and System.getEnv()

I use tomcat and I want to get an environment variable in my java code. To set an environment variable, I use this ... but not on my server... 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 - DynamoDB JsonMarshaller cannot Deserialize List of Object

I have a Java class which is the data-model of a table in DynamoDB. I want to use the DynamoDBMapper to save and ... )) { // 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 - cvc-elt.1: Cannot find the declaration of element 'beans'

I am trying to get a bean object to authenticate the user login functionality with Spring Security: ApplicationContext ... for element 'import'. 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 debug hadoop mapreduce jobs from eclipse?

I'm running hadoop in a single-machine, local-only setup, and I'm looking for a nice, painless way to debug mappers and ... true) ? 0 : 1); } } 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 - Protected fields not visible to subclasses

I'm writing a custom view that directly extends android.view.View. If I try to access fields mScrollX or mScrollY, ... that I don't want. 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 - Huge arrays throws out of memory despite enough memory available

Using the -Xmx1G flag to provide a heap of one gigabyte, the following works as expected: public class Biggy { ... 's the missing memory gone? 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 fix the error: "INFO: HHH000206: hibernate.properties not found"?

I tried to test whether the hibernate configuration is working properly. I tried but I got an error: INFO: ... Can anybody please help me? 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 - Android regular task (cronjob equivalent)

The last time this question was asked (by a different user), the answer response was: If this is in a ... AsyncTask. Thanks in advance :) 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 color a pixel?

I have to create a simple 2D animation without using various primitives for drawing line, circle etc for the purpose. ... the same can be given. See Question&Answers more detail:os...

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

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what is similarity and difference between jpa and hibernate. 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 do “sequential” Job Scheduling (Quartz?)

I'm making use of Quartz Scheduling and there are 2 jobs. First Job is performing the tasks for around 2 ... on the completion of first job? 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 find source component that generated a DocumentEvent

Is it possible to discover which oject generated a DocumentEvent? Something like i can do with ActionListener: ... the listener at runtime. 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 does a HashMap rehash the hashcode supplied by the key object?

I am reading the code of the HashMap class provided by the Java 1.6 API and unable to fully understand the ... value to the hash distribution. 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 - Count number of possible paths up ladder

I can't seem to come up with an algorithm to solve the following problem, I tried using a series of for- ... how to manage with larger ones. 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 fill RecyclerView Adapter with Firebase

I made a lot of research, but I couldn't find any resource how to use Recycler View with Firebase(or vice ... ? Do you have any suggestion? 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 design undo & redo in text editor?

Part of my project is to write a text editor that is used for typing some rules, compiling my application ... structure of persistent of file? See Question&Answers more detail:os...

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

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256 views

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java - How do I sanitize SQL without using prepared statements

For some sql statements I can't use a prepared statment, for instance: SELECT MAX(AGE) FROM ? For instance when ... Java? There is one in ruby. 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 - Jackson deserialize based on type

Lets say I have JSON of the following format: { "type" : "Foo" "data" : { "object" : { "id" : ... can this be done using a custom deserializer? 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 - Reverse bits in number

For example, I have the binary number 1011 which is equal to decimal 11. I want the reverse bit's location such ... 26. What is the mistake? 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 some beans in Filter bean class?

In my filter bean class, I added some beans dependency (with @Autowired annotation). But in the method doFilter(), ... xx.xx.xx.xx/MyApp/fbauth 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 - Android: Reading from file (Openfileinput)

I am trying to write a basic "notepad" app for a school project. I have created the main class with an editText ... and how do I implement it? 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 - Generate all valid values for a regular expression

I know by using Xeger, we can get a random value for a specified pattern. String regex = "[0-9]{2}"; ... number of values to reduce the amount. 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 configure Lombok with maven-compiler-plugin?

I have a root module and submodule in maven in the project. I am trying to use Lombok. I have added < ... maybe I am doing smth wrong. See Question&Answers more detail:os...

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

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