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Is it possible to update my google app engine java application without dropping user traffic?
AppEngine deploy procedure doesn't put your site nor your data in offline/read only mode. As far as the deploy is implemented your user won't notice any issues (as long as your new code didn't introduced any)
yes u can ..
gae projects allows multiple versions for the same project ,you can have upto 8versions i think ..
say ur application name is abc.com
u can deploy ur project to another version like 2.abc.com
and when ur okay with the version 2.abc.com
you can change that to default in GAE .
Now refering to abc.com will actually refer to 2.abc.com this will not affect any of ur traffic
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I am developing one android application in java and i am using neo4j as a database for this app.
Lets, consider i will store the static cypher query in a string. Then after the user clicks on the button, i want to send this query(string) to neo4j server and then execute it on neo4j server and return the result.
My question is that, Is it possible? If yes, how can i do this ? Is there any easy/proper way to do?
Any help will be highly appreciated.
If you want to talk directly to Neo4j, you can use either:
The HTTP API
The Binary Bolt Protocol
If you would rather use middleware, there are many many different options:
Java
.NET
JavaScript
Python
Go
Ruby
PHP
...
When building mobile apps my personal preference is to build a standard API in a middleware server then use HTTPS calls from the app (neo4j-graphql-js has also been awesome for a couple projects), but there are enough stacks that you have the freedom to do it your way.
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I have created my website using Java Enterprise Edition (JSP/Servlets) and MySql 8 for my database. It is a typical CRUD application with a feature that let the user track the car's location.
I thought of using Flutter since it will save me time with its cross-platform capabilities but I have'nt found any documentations that will make the user login from the app to my website and fetch some data.
I'm pretty sure it is possible somehow. Otherwise is there a way to simulate my website as fast as possible without using Chrome obviously.
Read the concept of Rest APis.Simply use the api to fetch data and you can also save data through api.You need to Connect your app to your web APi.
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I need to learn java programming, I have a LAMP server running and i need to build a webapplication(dynamic website). I have planned to use HTML, CSS, JS and Java for server side scripting instead of PHP using eclipse IDE.
My question is does the above thing work out and also if i want to deploy the files do i need to send the files to /var/www/html/ or any other method of deployment is there ?
Your question is weird, but yes, you can make a application with Java for the server side, read about JSP. And the files folder depends on the local server you're using , though most of the time for unix thats the right folder.
Good luck , I think you research a lot.
Edit: I was about to edit this for the LAMP definition, LAMP stands for Linux, Apache, MySQL and PHP... So you're not technically using that..
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I have photo sharing application running on Parse. So if I will migrate to Parse Server, should I change my Android Code or it's just backend thing? And what is the best and the easiest way to migrate from parse without building new system on my own physical server.
Thank you.
If you are migrating to parse server, you shouldn't need to change your Android code. You will need to update to the latest android sdk and initialize parse with your own serverURL however. The serverURL is wherever you decide to host your parse server.
Hosting parse server is straight forward. Check out the parse server example here. They have links to one click deployment to a bunch of different paas providers such as heroku. If you have a lot of cloud code the migration process can become more complicated and is probably out of scope for this question. Most of it is outlined in the docs however.
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I need to make a cross platform application than can run on MAC, Windows, Linux and also on web. Can JAVA be used for this? If yes then what type of JAVA project and what architecture should I use? And also need to implement MVC.
My Application will store data on local pc and will also have same interface on web. And both platforms will keep in sync!
Your choices are somewhat as follows.
Create a remote server
Create a Swing desktop client
Use the Swing client through Web Start or create a separate web
client on the remote server (with any frameworks of your choice).
Obviously the choice without a separate web client is simpler, but it also means that all "web" users must have Java installed and Web Start must be allowed.
Yes java is best fit for this....about project type first of all decide the frameworks you are going to use.