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I want to dive into graphQL using Java. I want to query an existing graphQL Service. From what I have found so far are ways to generate the graphQL schemafiles either in JSON or IDL from your POJO classes, but not the other way round....?
From what I have understood so far, I would have to create the java classes myself that "represent" the objects I would receive from a query. But the service I want to use has tons of endpoints and queries and the need of writing each pojo class myself sounds like I have missed something... I assume there must be a way to generate stubs like I am used to from REST API frameworks using swagger or yaml files?
So... how can I generate the pojo classes automagically given only the schemafile?
I have read the description of the schema-first approach at graphql-java but they also assume to write the pojo-classes by oneself.
thank you
You can use a plugin for your build tool to generate POJOs for GraphQL types/inputs/interfaces/enums/etc and interfaces for queries/mutations/subscriptions. All based on your GraphQL schema.
Link to the project: https://github.com/kobylynskyi/graphql-java-codegen
It has the following plugins for your build tool:
Maven plugin: https://github.com/kobylynskyi/graphql-java-codegen/tree/master/plugins/maven
Gradle plugin: https://github.com/kobylynskyi/graphql-java-codegen/tree/master/plugins/gradle
SBT plugin: https://github.com/kobylynskyi/graphql-java-codegen/tree/master/plugins/sbt
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I am new in Jhipster.I want to use both jBPM and Jhipster.I am not able to call even simple jbpm process using Jhipster.
Firstly I tried to run simple jbpm process through rest API call it gives me an error H2 datasource not defined.
At second time I tried to run simple jbpm process where I used persistance.xml for jBPM database connectivity then I got an error as No Persistence provider for EntityManager named org.concreatepage
Please help me to come out of it.
Thanks.
We implemented it, for one of my customer, so I can't share any code. But it is pretty simple.
All steps you can follow:
First, generate a JHipster project with simple configuration (no MongoDB, Cassandra, etc)
Look at the code at this repository https://github.com/mswiderski/jbpm-examples/tree/master/spring-boot-jbpm
Add dependencies, config xml files, etc.
Alternative solution would be to use Activi:
here the ticket: https://github.com/jhipster/generator-jhipster/issues/6454
here the module: https://github.com/Activiti/generator-jhipster-activiti
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At my work, all the Java projects so far use tools (ex: JAXB or other Json libraries) to generate Java POJOs from schemas. Can anyone tell me what the pros and cons of this approach vs writting Java domain classes by hand. Thanks
I also use JAXB at my workplace and i really find it very useful. On the very high level, the advantage of using JAXB over writing POJOs is simply what you get from an automated tool. You do not need to take the effort of doing it yourself.
I have more pros of using JAXB.
The output generated by it quite tight and efficient.
Best electronic documentation provided by JAXB download.
It gives integration with newer technologies like JAX-RS and JAX-WE.
Working on raw XML can be really tedious.
It comes bundled with Java6 or later versions.
Edit 1:
CONS: I feel we can have performance level cons as compared to other similar plugins. However, CON with respect to the alternative is that we might miss out the learning the we may get by writing it ourselves. We can definitely make a good attempt for learning if system is not so complex.
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I am trying to create an app that would be able to generate kickstart scripts (along other things) and for one of the things to add was a list of packages you can install (obviously wont display them all, but will have a function to allow you to know if the package is available).
The problem I am finding is finding any documentation on how yum/apt read their repositories.
Does anyone know on where to find documentation on this sort of thing or if there is an open sourced app that does a simular thing (reading the repository that is)
APT and YUM repositories have different internal metadata formats:
APT: Can be parsed with libapt, or your own tools. It is pretty straightforward as the metadata format isn't too complicated.
YUM: Can be parsed with any XML library; the metadata is stored as XML and easily parsed with any XML library for any major programming language.
You can learn more about YUM repository metadata in this blog post. You can learn more about APT repository metadata in this blog post.
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please help me to creating webservice with struts 2 either be using of Eclipse or be using of Netbeans.
First you need to know to basic idea behind Web Services and how it works:
A short introduction to Web Services
Then, you need to generate Java classes from the given WSDL file(if there is one, otherwise you need to communicate through SOAP directly):
Creating Java Classes from WSDL file using Apache Axis 2
Generating Java code from a WSDL document
Note: The reference given using Apache Axis 2. There are others ways to do the same task this one of them.
Also, you need to deal with Certificates issue (if it is required). I can not tell much about it. Since, it depends on your case.
Now you can work with your Java application, where you need to establish SSL connection, send requests and receive response from the Server you are requesting services form it.
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I have java product with rich set of api. I want to write scala api as a wrapper over those java api. Are there any guidelines for the same. Please share your experience
This is a very vague question as others have noted, but I suppose there are some broad suggestions:
Use JavaConverters to translate Java collections to Scala collections.
Use Scala annotations to represent properties or characteristics represented by other means in Java. Examples of these include #deprecated, #throws, and #BeanProperty. #BeanProperty is especially useful if you want to use a library that specifically demands JavaBeans (i.e conforms to the specification).
If the Java code uses Spring, maybe look into Spring Scala if necessary. Or use more constructor-args. Or asInstanceOf to cast any beans you manually fetch from the context.
Build files. Perhaps you want to replace any Java-specific build mechanism with SBT. Or transform your Java-focused Gradle build file to be more Scala-focused. That kind of thing.
That's all I can think of. Hopefully others will point out other considerations I've missed.