#Java

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Java is a general-purpose computer-programming language that is concurrent, class-based, object-oriented, and specifically designed to have as few implementation dependencies as possible.

Question
· May 12, 2017
Web Sockets

Hi

I am working on a project that will interact with some software called ROS (Robot Operating System). One of the development challenges we have is as follows:

ROS uses web sockets... So one connect with ws://localhost:9090 to the web socket server. It starts off as http, but then "upgrades" to web socket. It then keeps open this "tunnel" for bi-directional communication..

I need something like a HTTP Outbound adapter, but the Web Socket version of it...

Does anyone have any experience in this area?

Nigel

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Hi

Totally new to IRIS and Cache.

Trying to evaluate it and work out how we could use it.

As a standard application database. Object or relational etc. does not matter.

Issue is ObjectScript.

So:

1) Can we develop, maintain and use an IRIS database and never use ObjectScript i.e. use only Java, Python, C++ interfaces etc. (exactly which one does not matter)? Would that make designing and using the IRIS database more prone to inefficiency and error?

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Working on implementation FHIR to my project, I found interesting project HAPI-FHIR, which could help me to quickly launch my FHIR api server with InterSystems Caché as a storage, because this projects uses Hibernate to connect to database, as an example they use DerbyDB. I tried to change settings to use InterSystems Caché, but unfortunately it does not work and throw some errors inside HIbernate. As I found in Caché documentation, I have not some many options, I just have to set Cache dialect, and set database url.

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Hello,

I work on deploying IRIS using Kubernetes operator and Red Hat OpenShift. I encouraged another team working on Java application to consider using IRIS as database. My team deployed IRIS cluster using two mirrored data pods for the other team. The other team asked me for the connection information.

To learn how to use Java with IRIS, I attempted to deploy two apps from Open Exchange:

https://openexchange.intersystems.com/package/CRUD-GLOBALS-IRISNATIVEAPI...

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So, I needed to start Java Gateway, and found, that it does not want to work with the latest Java versions, I tried 20, 18, 17

Start External Language Server %Java Server:
Please wait...result will show below:

2023-07-26 19:46:24 Starting Java Gateway Server '%Java Server'
2023-07-26 19:46:24 *ERROR* Return from RunStartCmd: ERROR #5049: Java version '18.0.1.1' is not supported.
2023-07-26 19:46:25 An error occurred while trying to start the Gateway Server External Language Server failed to Start:
ERROR #5049: Java version '18.0.1.1' is not supported.

Error, only says, that it will not work, and say nothing, about which version it wants to see

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Hello all,

I am trying to start java gateway and constantly getting an error in terminal:
"%RemoteService+3^%Net.Remote.Gateway.1 *%Exception.StatusException ERROR #5023: Remote Gateway Error: TCP error on port '55555', ensure there is an Object Gateway running on this port". I've checked jvm and it is running properly, telnet also is able to connect to the port.

Has anyone encountered this issue before?

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A new Health Connect customer has a few experienced Java folks on their interface team. As they get more into Health Connect and learn Caché ObjectScript they thought it would be useful to have a list of common Java statements with an equivalent statement in ObjectScript. They mentioned string manipulation as an example, but would be interested in other areas as well.

This seems like something that is probably already floating around somewhere. Does anyone have something like this or other "COS jumpstart for Java devs" materials?

Thanks,
Marc

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Hello everyone,

I'm trying to authenticate a user(Health Share clinician) from a Java Application.

I 'm already connected to Caché and able to run SQL commands.

My question is: How can I authenticate a user using only SQL? In fact, what I want is verify if the users exists in the base and if the given password is the same used in Health Share.

There is a column 'password' in Security.users table but I'm not able to see its content, even so, I don't know which hash function to use to compare with.

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As part of a migration project from a bunch of java classes to IRIS, we need to maintain a few jar files due to some external dependencies.

The problem I am seeing is that I cannot pass a byte array ( byte[] ) from ObjectScript to the Java Class. I have tried a number of different ways

I have reproduced in a java class and Objectscript class:
Java Class:

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I have two local instances:

  • IRIS for Windows (x86-64) 2018.1.2 (Build 626_3U) Wed Jun 12 2019 19:07:59 EDT
  • IRIS for Windows (x86-64) 2019.1 (Build 510U) Thu Mar 14 2019 14:13:37 EDT

I'm using Java Gateway to talk to external system.

Both instances are using the same:

  • jar
  • generated class
  • java version


They are calling the same method with this java signature:

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Question
· Aug 2, 2020
Kafka Java Host

I'm trying to produce Kafka Message to Topic using Java Objects. I have build Business operation and Jar file and trying to execute. I'm getting following exception

Terminating Job 8316 / 'IrisKafkaProducer' with Status = ERROR #5046: Error executing java command 'init() returned: "ERROR #5034: Invalid status code structure ("java.sql.SQLException: [InterSystems IRIS JDBC] Communication link failure: Access Denied")"'. Java may not be installed correctly on your system., %QuitTask=

Getting following trace at Audit Database

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Recently I started moving some of our JDBC Gateway configurations over to using the Microsoft JDBC Gateway driver instead of using the jTDS open source driver. I have noticed since then that those Objects that are using Microsoft JDBC Driver are throwing a lot more errors than the jTDS driver ever did, which I can understand however I am puzzled that I keep running into an issue with the Java Gateway Service within the Interoperability engine.

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Question
· Oct 8, 2020
Report Render Server Error

Hi everyone, i'm using a render server to make pdf output with zen report and everything was fine till recently i've been getting this error message and i have no idea what it means, i'd be very thankfull if someone could help or got into the same situation.

Error message:

ERROR #5001: net.sf.saxon.trans.XPathException: org.apache.fop.fo.ValidationException: "fo:table-body" is missing child elements.
Required content model: marker* (table-row+|table-cell+) (See position 817:-1)

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Hi,

I have a stored procedure which would generate a standard Cache String and it would be called through JDBC and I would

dump the result in java console/standard output.

What kind of characters should I use in COS so when output get send back to Java side, it knows it contains new line character ?

Thank for your help.

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Question
· Dec 2, 2019
Operation System Permission

Hi all...

I am try to execute a class method from JDBC connection. My method are simple, just create a file at $HOME like this:

set sc='$zf(-1,"touch $HOME/lixo.txt > /var/tmp/log666 2>&1")

I put a log file to this commnad because it's don't work, and in log file i get this:

touch: cannot touch ‘/root/lixo.txt’: Permission denied


after to try other commands I found that user and enviromnent variables are diferents:
I try this:

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