java-base | Reflection library
kandi X-RAY | java-base Summary
kandi X-RAY | java-base Summary
java-agent、jvm-access、jvm-classloader、jUnitPerf、Java基础算法；JAVA基础知识、枚举、反射、异常、泛型、集合、线程、代理；我的博客里面有相应的解释，以及动态的gif图片引导你理解
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Top functions reviewed by kandi - BETA
- Returns the hello class .
- Compare 2 .
- sort array .
- Runs the Baidu service .
- Returns a new list of nodes .
- Reverses a part of a given range .
- The main method used for debugging .
- merge int array .
- quick sort .
- set min heap .
java-base Key Features
java-base Examples and Code Snippets
Community Discussions
Trending Discussions on java-base
QUESTION
docker-compose
...ANSWER
Answered 2021-May-04 at 11:04configurations {
jdbcdriver
}
dependencies {
jdbcdriver 'com.oracle.database.jdbc:ojdbc8:12.2.0.1'
}
task createFlywayUser(){
doLast {
configurations.jdbcdriver.files.each {
Sql.classLoader.addURL(it.toURI().toURL())
.
.
.
}
}
QUESTION
I'm building an application that involves a frontend (javascript browser-based client) and a backend (a Java-based service).
For one of the APIs (POST method) that will be called from the browser to the backend service (upon filling a form in the frontend), I'm planning on passing the request body (JSON) as follows
...ANSWER
Answered 2021-Jan-29 at 10:05Usually, in design problems, there is no single correct answer, a solution can be good for one problem and it can be bad for another problem.
I prefer the approach of creating an array of Object ( lets call our class as FieldData). In above example, FieldData class is:
QUESTION
Why do we need META-INF/spring.factories when create starters for Spring Boot applications? What if omit it at all or leave empty?
Doesn't the target application's @SpringBootApplication which is
a combination of three annotations @Configuration (used for Java-based configuration), @ComponentScan (used for component scanning), and @EnableAutoConfiguration
scan everything and find all beans from all the starters with no help of META-INF/spring.factories?
ANSWER
Answered 2021-Apr-28 at 10:35Component Scanning would scan the packages that you give it. You could technically tell it to scan all the packages of your dependencies, too, and it would start loading up any beans defined in them. If you don’t specify any packages to scan, then Spring will use the base package where the annotation is applied, which would very likely not include beans defined in any dependency libs.
There’s another layer to this- a lot of the libraries you use may be using annotations like “@AutoConfigureBefore” to give spring instructions on the order of bean creation. Component Scanning will not respect that, which could result in some weird behaviors if some dependency tries to override a bean from another which is annotated with @ConditionalOnMissingBean (I.e. create this bean only if it doesn’t exist.) You could easily end up with name collision issues where that bean actually gets created first, and then the override bean is created, too.
So the answer seems to be no. You need spring.factories.
QUESTION
I'm trying to change the app language in Java-Based Android. This is the function:
...ANSWER
Answered 2021-Feb-13 at 04:53Replace your function with this one:
QUESTION
I purchased the domain name 'jimtough.org' directly from Amazon so I could use it with a Cloudfront distribution. Now I have a very simple vanity site at https://jimtough.org/ that uses the certificate. I also played around with AWS API Gateway and confirmed that I can use the same certificate to provide HTTPS secured URLs to work with API Gateway.
I am also running a Java/Spring Boot web application on an EC2 server. I have already associated a Route53 DNS name with the EC2 server that hosts my Spring Boot application, like this: http://instance-b.jimtough.org/. This works, but it is using unsecured HTTP. I get a bunch of warnings when I try to do basic authentication in the application, since it would be sending my username/password via an insecure connection. Fair enough.
So my next step is to enable HTTPS in Spring Security and force secure connections to the application. In order to do this, I first need to provide a certificate for the Java runtime on the EC2 host to use. I found examples of how to do so with a self-signed certificate:
- https://mkyong.com/spring-boot/spring-boot-ssl-https-examples/
- https://www.baeldung.com/spring-boot-https-self-signed-certificate
Unfortunately, using a self-signed certificate is not what I'm looking for. I want the user to be able to browse my static content vanity site first (https://jimtough.org/), and then follow a link to my web app and keep using the same site certificate (my AWS-issued cert) for my Spring web app.
QUESTION: How can I use my AWS-issued certificate with my Java-based web application?
Inside the AWS Certificate Manager (https://console.aws.amazon.com/acm/home?region=us-east-1#/), I don't see any way to 'export' or save my certificate. Am I missing something? Maybe Amazon doesn't want me to use this certificate outside of their own services?
Note that I did originally set up the certificate with the domain name as 'jimtough.org' and the Additional Names field set to '*.jimtough.org' so I can use the certificate on sub-domains as I'm trying to do here.
EDIT
The accepted answer from julien-b is correct. I did some more research and found that SSL certificates aren't cheap, and come in different flavors. The cheapest is the 'DV' (Domain Validation) type, which only verifies that the SSL certificate is controlled by someone who also controls the DNS record for the associated domain (such as 'mydomain.com'). There are much more thorough (and expensive) certificate types that can be issued, where the issuer has to do background checks on the owning organization. Those are meant for sites that handle e-commerce, financial transactions, etc. Not at all what I need.
There are also multiple types of multi-site certificates to choose from. The very cheapest single-domain certificates only cover your primary domain and the 'www' subdomain (mysite.com and www.mysite.com). If you want all the subdomains of your primary domain covered (app.mysite.com, ftp.mysite.com, etc), then you'll need a 'wildcard' certificate. Those are significantly more expensive. The more exotic certificate types can cover multiple different domains. These seem to be aimed at making certificate management easier for organizations that manage a lot of different domains and don't need a different certificate for each. Not what I need, so I didn't investigate further.
I decided to go with a 'single-domain with subdomain wildcard' certificate from Comodo (recently renamed to Sectigo?), who appears to be the most affordable certificate vendor right now.
REFERENCE: https://www.techradar.com/news/best-ssl-certificate-provider
It seems like a missed opportunity for Amazon that they don't get in on this game and issue their own SSL certificates for a fee. AWS already has all the infrastructure in place to do so, at least for the DV-level certificates.
...ANSWER
Answered 2020-Dec-19 at 21:17You cannot export the private key of a publicly trusted ACM certificate. You can use ACM certificates with some managed services, but it doesn't work for all use cases.
https://docs.aws.amazon.com/acm/latest/userguide/export-private.html
AWS Certificate Manager is integrated with other AWS services, so you can provision an SSL/TLS certificate and deploy it with your Elastic Load Balancer, Amazon CloudFront distribution or API in Amazon API Gateway. AWS Certificate Manager also works with AWS Elastic Beanstalk and AWS CloudFormation for public email-validated certificates to help you manage public certificates and use them with your applications in the AWS Cloud.
https://aws.amazon.com/certificate-manager/features/?nc=sn&loc=2
Should you want to use a certificate on a service that is not integrated with ACM or even on-premise, you should get your certificate from another source.
As for the ACM Private CA, it is meant to be used within an organization thus not matching your use case.
https://docs.aws.amazon.com/acm-pca/latest/userguide/PcaWelcome.html
QUESTION
I am trying to have several different Spring Cloud Microservices all connect to a Kafka/Zookeeper Cluster, all within Kubernetes. The Microservices are using org.springframework.kafka:spring-kafka - as both consumers and producers of events.
All of the services connect to kafka okay - and topics are created; however the consumers of each service are very inconsistent.
For example, when the services start one time, all of the consumers will listen for the message and the function is invoked. But then, when I restart everything (kafka and zookeeper included), it will either just not work, or some of the consumers in different services will work etc...
Here is some of my config - I don't have any Java-based config - just in my application.yml as follows:
...ANSWER
Answered 2020-Nov-28 at 22:45Btw, you can read here more about the relation between the number of partitions and the number of parallel consumers (consumers with the same group id).
https://docs.confluent.io/platform/current/streams/architecture.html
Slightly simplified, the maximum parallelism at which your application may run is bounded by the maximum number of stream tasks, which itself is determined by maximum number of partitions of the input topic(s) the application is reading from. For example, if your input topic has 5 partitions, then you can run up to 5 applications instances. These instances will collaboratively process the topic’s data. If you run a larger number of app instances than partitions of the input topic, the “excess” app instances will launch but remain idle; however, if one of the busy instances goes down, one of the idle instances will resume the former’s work. We provide a more detailed explanation and example in the FAQ.
QUESTION
How can I use DefaultJobParametersValidator in a Java-based Spring Batch Application? Should I call it manually in a Tasklet? I cannot find any examples that does not used an xml configuration.
...ANSWER
Answered 2020-Nov-16 at 10:45A JobParametersValidator is used to validate job parameters before every job execution. You do not call it manually, you need to register it in your job definition and Spring Batch will call it for you (this is how frameworks work). The DefaultJobParametersValidator will be used by default if you do not specify a custom validator.
The JobParametersValidator section in the reference documentation shows how to register a job parameter validator in both XML and Java configuration styles.
QUESTION
Just as a background, I have a Java-based Discord bot deployed on Heroku using the 1 free worker dyno. I need to run a .exe file (stockfish 12 executable), pass input into it and process output from it. I'm using Java RunTime to create this Process but when I try to send input to it with the flush() method the broken pipe error is thrown. I assume Heroku must be closing the input / output stream somehow because this code runs fine locally. Does Heroku have a limit on creating sub processes?
app[worker.1]: chess.player.ai.stockfish.exception.StockfishEngineException: java.io.IOException: Broken pipe app[worker.1]: at chess.player.ai.stockfish.engine.UCIEngine.sendCommand(UCIEngine.java:39) app[worker.1]: at chess.player.ai.stockfish.engine.UCIEngine.passOption(UCIEngine.java:77) app[worker.1]: at chess.player.ai.stockfish.engine.UCIEngine.(UCIEngine.java:23) app[worker.1]: at chess.player.ai.stockfish.engine.Stockfish.(Stockfish.java:13) app[worker.1]: at chess.player.ai.stockfish.StockFishClient.(StockFishClient.java:21) app[worker.1]: at chess.player.ai.stockfish.StockFishClient$Builder.build(StockFishClient.java:80)
EDIT: I tried to simplify the program by hard coding a single command and it still fails to get past the writer.flush() line. Nothing is printed.
...ANSWER
Answered 2020-Oct-08 at 02:25output stream closes itself. When you run a command, create a new process or this command must block a stream and await an input.
Recommend ProcessBuilder, it is more easily to configure:
QUESTION
I have a function that creates a new key in the iOS keychain using this method:
...ANSWER
Answered 2020-Oct-06 at 17:04You made a minor mistake at kSecClass as String : kSecAttrKeyType. kSecAttrKeyType is a key indicating the type of the key (kSecAttrKeyTypeEC/kSecAttrKeyTypeECSECPrimeRandom/kSecAttrKeyTypeRSA). So you should pass the correct kSecClass which for you should be kSecClassKey.
I'd like to point out that the output of the SecCopyErrorMessageString is a bit bad every now and then. Always try to print the OSStatus as well and use that on OSStatus. Which in this case would not have given you greatest hits, as it would've returned -50. But the combination of the two identifies them uniquely enough to define it as errSecNoSuchClass found here.
QUESTION
I'm calling a Java-based API. It's throwing a validation exception for a DateTime.
Required format is: yyyy-MM-dd kk:mm:ss
Where kk formats hours between 01:00 and 24:00, NOT (00:00-23:00).
This is not a typo, it's an acceptable pattern letter for Java's SimpleDateFormat.
Is anyone aware of a good format string or an extension method to accomplish this in C#?
...ANSWER
Answered 2020-Sep-24 at 17:28I've ended up using this smelly line of code:
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Install java-base
You can use java-base like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the java-base component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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