# Secondary Index on Custom Java Object
**URL:** https://discuss.aerospike.com/t/secondary-index-on-custom-java-object/6485
**Category:** Query & Indexing
**Tags:** index
**Created:** [July 16, 2019, 4:55pm UTC](https://discuss.aerospike.com/t/secondary-index-on-custom-java-object/6485 "2019-07-16T16:55:24Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@sd.hrishi](https://discuss.aerospike.com/u/sd.hrishi)
#### Post date: [July 16, 2019, 4:55pm UTC](https://discuss.aerospike.com/t/secondary-index-on-custom-java-object/6485/1 "2019-07-16T16:55:24Z")
I have two classes.
```
class A {
String aName;
B b;
public A(String aName, B b) {
this.aName = aName;
this.b = b;
}
public String getaName() {
return aName;
}
public B getB() {
return b;
}
}
class B {
String bName;
public B(String bName) {
this.bName = bName;
}
public String getbName() {
return bName;
}
}
```
I am storing A as a set in Aerospike and **A.aName** is primary key. I want a secondary key on **A.b**. I have created index on **A.b** attribute and able to persist also. But search from the index is not returning anything. As per my understanding, Aerospike supports only three type of indexes: String, Numeric and Geo,. Is there any option for custom object.
Cross posted to Stack Overflow: [Secondary Index on Custom Java Object in Aerospike - Stack Overflow](https://stackoverflow.com/questions/57062877/secondary-index-on-custom-java-object-in-aerospike).
---
### Author:  [@Albot](https://discuss.aerospike.com/u/Albot)
#### Post date: [July 17, 2019, 5:57pm UTC](https://discuss.aerospike.com/t/secondary-index-on-custom-java-object/6485/2 "2019-07-17T17:57:13Z")
Are you storing it as a binary blob? What type is A.b ?
---
### Author:  [@sd.hrishi](https://discuss.aerospike.com/u/sd.hrishi)
#### Post date: [July 18, 2019, 6:40am UTC](https://discuss.aerospike.com/t/secondary-index-on-custom-java-object/6485/3 "2019-07-18T06:40:20Z")
Yes, I am storing as object through Java client, which would be Blob i think.
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### Author:  [@Albot](https://discuss.aerospike.com/u/Albot)
#### Post date: [July 19, 2019, 5:05am UTC](https://discuss.aerospike.com/t/secondary-index-on-custom-java-object/6485/4 "2019-07-19T05:05:29Z")
Binary blobs can be anything, there’s definitely no way to index that. If there is a particular field in your class you can pull out and set as a separate bin with a string/long type then that would work…
---
### Author:  [@sd.hrishi](https://discuss.aerospike.com/u/sd.hrishi)
#### Post date: [July 19, 2019, 6:34am UTC](https://discuss.aerospike.com/t/secondary-index-on-custom-java-object/6485/5 "2019-07-19T06:34:41Z")
Thanks @Albot, we did the same thing and it works also but wanted to know some other alternative.
---
### Author:  [@kporter](https://discuss.aerospike.com/u/kporter)
#### Post date: [August 20, 2019, 12:01am UTC](https://discuss.aerospike.com/t/secondary-index-on-custom-java-object/6485/6 "2019-08-20T00:01:18Z")
This was also posted to Stack Overflow where @rbotzer provides a few ideas for modelling.
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