I am new to deployment and development of web applications.
Suppose I create three jar files and deploy them on a Tomcat server. I use maven to install the jar file and to deploy.
How is it possible to call a method in another jar file?
For example:
I developed a simple application in mytwitter.jar.
Then, I create myapp.jar, where one of the classes needs to call a method in mytwitter.jar.
Do I first deploy mytwitter.jar to the server and myapp.jar later?
You package all of the JARs you need (yours and 3rd party alike) into a WAR file which is what gets deployed to the Tomcat server. So in your maven config you likely already have dependencies configured for things like the twitter API and other packages. Just add your own JARs in there as well and then your code has access to it like anything else.
Related
I am trying to run a dotnetcore Console application in a ServiceFabric GuestExecutable Container. While I was adding this GuestExecutable service to my SF application, I cofigured as follows
Code Package Folder -> ..repos\NewDllGuestSF\CoreConsole\bin\Debug\netcoreapp2.0
Program -> CoreConsole.dll
Working Folder -> CodePackage
Here, I know I am trying to host this .dll file as my executable for the GuestExecutable service. This is what I am trying to do but could not somehow. When I tried the same with the treditional .NetFramework app and with an .exe executable, I am able to run it successfully on SF cluster. But I need to do is with dotnetcore application and of course with a dll executable.
So far I have tried is -
I can generate a dll as well as an exe while building my dotnetcore console application and use the generated .exe file in GuestExecutable. But here, I have to configure my console app to target multiple Frameworks as "netcoreapp2.0;net461", that is something I can not do for some reasons.
When I run my dotnetcore Console app with a dll executable in SF cluster, I faced the following error
Here if we see, the GuestExecutable service remains in healthy state but the application doesn't.
Can anyone please help me out on this, all I want to do is to host a .dll file as entry point in a GuestExecutable SF service.
As far as I understand you need to configure CodePackage in ServiceManifest.xml to run your .dll using external executable.
Here is the example how this could be done (please pay attention to IsExternalExecutable="true" attribute):
<CodePackage Name="Code" Version="1.0.0">
<EntryPoint>
<ExeHost IsExternalExecutable="true">
<!-- We are using dotnet cli to launch our Service.dll -->
<Program>dotnet</Program>
<Arguments>Service.dll</Arguments>
<WorkingFolder>CodePackage</WorkingFolder>
</ExeHost>
</EntryPoint>
</CodePackage>
Hope it helps.
Suppose when I make a java spring boot application, it needs jars .
But when I deploy my app to cloud foundry will all the jars get build with my app and then go to cloud foundry or cloud foundry provides the jars dependency by seeing pom etc.
I have seen build folder but the jars are not there so how does it work.
I am new to cloud foundry so if someone can clear my doubt.
For most application types and build packs, when you push an application to Cloud Foundry you are pushing source code, and, if necessary, that source codes gets compiled during the staging process by the build pack. For example, with the Golang build pack you push your Go source code and it's compiled in staging and then run.
The two exceptions to this rule are the Java build pack and the binary build pack. These two build packs assume that you are pushing compiled bits and do not compile anything for you.
In the case of Java, this means that you're going to run Maven, Gradle or some other build system locally or on your CI system to produce a deployable artifact. This could be a WAR file or a JAR file, or a few other things (see "Standard Containers" on the Java build pack docs for other supported formats). Regardless of the format, it needs to be a complete and deployable unit, so it will need to include all dependent libraries.
As a side note, the cf cli has a nice feature that helps to speed up the cf push process and save bandwidth. It matches any files being uploaded and over 65k in size (default, operators can change this) to files cached on the Cloud Controller. If a local file already exists in the cache, it is not uploaded again. This works great for dependent JAR files which don't often change between pushes.
Spring Boot apps are typically packaged as "fat jars" using the Spring Boot maven or gradle plugin. The application code and all dependent jars are packaged into a single jar file.
Cloud Foundry will not download dependent jars when a Java application is deployed. It is the app's responsibility to bring all dependencies with it.
Follow up to this question:
Application Insights added ConnectedService.json file to my project, what does this do?
When I create a deployment package, via "Publish..." option, the package also include the following folder and files:
Service References\Application Insights\ConnectedService.json
I do not want to deploy something that is not required at runtime. Do I have to include the folder and file in my production server deployment?
No. Those files are only used by visual studio for its information, to know what services have been added and give you links back to them inside VS. None of that needs to be deployed. those files can all be set to do not copy/etc.
I have prepared a web deployment package from my staging environment as a FileSystem. However, there is not a folder with necessary classes. My logic of hitcounter is situated there. I have tried to just copy this folder with classes to a web deployment folder, but I've caught an error when I try to run my website at a hosting provider. If I run locally my web application it works okay.
Is there a special way to include this folder to a web deployment package?
I run on a restricted shared hosting (godaddy).
if your hitcounter class is inside your project namespace it will be compiled inside your project dll. so if your namespace is like myproject.helpers.hitcounter, then it will be in the myproject.dll
there is no need to add the classes to your hosting service.
I am deploying a spring-mvc application which uses JPA to access MySQL database. Access information is stored in persistence.xml, while creating a deployment war file I would like to replace developer persistence with the production one.
I tried to copy the production xml directly into the deployment folder (intellij settings), but it has no effect a dev. copy is always deployed.
How do I configure IDE to do that?
If your project is mavenised, then you can use the maven-war-plugin or maven-resources-plugin to customise the resources used to build the war, and the ide should honour these plugins.