I like that fact that it is the most scalable and the best-of-breed application server for hosting any kind of an application. One of the best things about WebLogic Suite is that the enterprise customers we work with have a broad spectrum of Oracle products that they use, from BPM to E-Business Suite to whatever. One thing common to all of these solutions is the fact that they're all on WebLogic server.
It's multi-tenant, is highly available, and I believe it's the best-in-class application server for Java. Most of Oracle's products are in Java, so they are all supported on WebLogic Server. That is one of the biggest aspects. It's very reliable, it's enterprise-grade, so we get great support from Oracle as well.
Technically, there's absolutely nothing that you cannot get from a WebLogic Server in terms of availability and scalability. It is very easy to maintain, and if you look at other JMX process based servers, they don't give you a great console. But WebLogic Server gives you a console for administration, creating resources, managing those resources, troubleshooting, diagnostics, and everything else all in one place.
In an enterprise, a solution is not delivered by a single system but a lot of them. You would often find that to achieve a particular business function, you're using ABS, you're using Server Suite, you're likely using several other solutions. So WebLogic Server provides one common platform for deploying all of these applications, and you don't have to invest in five different application servers for five different applications that you're using. It helps consolidate your systems, especially your middleware servers.
Multi-tenancy is needed. It is starting to come in the latest releases, but it is a very basic multi-tenant feature at the moment. I would like a more enterprise-grade multi-tenancy feature coming into WebLogic. Many organizations use WebLogic for all of their applications, but what we also have to think about is that each application wants to share the platform, and they want some sort of isolation from other tenants or other business units in an organization. How WebLogic addresses that challenge is by having multiple tenants that share the same infrastructure without disturbing each other.
I've been using WebLogic since v5.0 to v12.2, where it is right now.
We've had no issues with deployment.
Stability is not necessarily dependent upon WebLogic, but it depends upon the type of application that you deploy. It's a common platform where you can put pretty much everything. Most often than not, what we see is a combination of WebLogic and the application that you deploy on top of it which causes stability issues, not just in isolation.
For example, you know that you have Java and that Java has memory leaks. But it's not just Java that's causing memory leaks, it's the application and Java in combination that can cause this problem. The same thing with WebLogic, so it's not just WebLogic alone. It is almost always your application as well as WebLogic Server together that causes a problem. But as a platform, it is very stable.
We can scale it to thousands of users without a problem. We've had no issues at all with scalability.
The initial setup is very easy and very straightforward.
For your admin console remark: if you don't require EJBs & JMS you could consider running in "wlx" mode (docs.oracle.com)