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Java EE 5 and Java EE 6 come with standardized packaging -- the Enterprise Archive (EAR), which makes the provisioning of cloud apps relatively easy. And EAR solves some cloud-interoperability issues: It's a lot easier to move an app from one cloud to another. Java EE 5 and 6 are portable, so applications can be easily moved from one application server to another, regardless of whether they run in a cloud or not. They both will run on JDK 5 or higher.
JVM itself comes with fantastic remote debugging, profiling, and monitoring capabilities. This already greatly simplifies the development of distributed apps and should also simplify cloud-enabled apps
2.2 Java 实现云计算的两种方式 Heavy UI oriented. Heavy framework oriented These types of applications or framework usually provide UI-based consoles, management applications, plugins, etc that provide the only way to manage resources on the cloud such as starting and stopping the image, etc. The key characteristic of this approach is that it requires a substantial user input and human interaction and thus they tend to be less dynamic and less on-demand. This approach strongly emphasizes dynamism of resource management on the cloud. The key characteristic of this approach is that it requires no human interaction and all resource management can be done programmatically by the grid/cloud middleware - and thus it is more dynamic, automated and true on-demand.
2008 年 5 月， Sun 在 2008JavaOne 开发者大会上宣布推出“ Hydrazine ” 计划， Sun Microsystems 公司 (NASDAQ: JAVA) 展示了 Sun 开放式云计算平台 (Sun Open Cloud Platform) ，即 Sun 公司的开放式云计算基础架构，该平台由 Sun 公司的行业领先软件技术，包括 Java 、 MySQL 、 OpenSolaris 和开放式存储等所驱动。
Abicloud is an open source infrastructure software for the creation and integral management of Public & Private Clouds based on heterogeneous environments. The tool mainly offers users the capacity for scaling, management, automatic and immediate provision of servers, storage, networks, virtual network devices as well as applications.