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Java and crystal reports: java object as a datasource in crystal reports

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Hi friends.

I have a hashmap there are around 10k rows.
Now i need to display this data from hashmap to a crystal report.
How to do it ?

I am working in CR for first time. So total beginner.
I just know that we need to map a datasource for any report we create.
If data cming from any in memory object then how to map this datasource ?
Another question is...can we have a dynamic datasource for an crystal report ?
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