Application Migration

Managing Multiple Parent Persistence Problem in App Engine

Agile, Java, , , , , ,

Reading Time: 3 minutes We are in process of porting an entire application on google app engine. This application has persistence using JPA and as usual contains mapping between entities using annotations. The mapping like @OnetoMany and @ManytoOne in Jpa may throw lot of errors in google app engine and therefore is neither straightforward nor trivial. In this blog we will see where our mapping may fail, with specific Continue Reading

Why Unowned Relationships Make More Sense With App Engine Datastore

Vikas HazratiAgile, Java, , ,

Reading Time: 4 minutes A month back we started migrating an enterprise time keeping and invoicing system to GAE. Initially, the application was deployed at the enterprise on tomcat. The opportunity was to port the application to GAE and utilize the public cloud space. The choice about GAE was based on the expected ease of migration and then not having to worry about any infrastructure maintenance. As you would Continue Reading

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