javassist - adding custom member variables

Question

We need to add different class member variables to a java object for each customer based on configuration. So we are using javassist to inject class members at byte code level based on config. Recently we came across an issue that for one customer we need to add more than 600 customer specific member variables. We able to make it for 600, but if we add more than 600 we are getting following error.

org.reflections.ReflectionsException: could not get type for name com.mycompany.xxxxxxxxxx.models.impl.AccountProduct
 at org.reflections.ReflectionUtils.forName(ReflectionUtils.java:389)
 at org.reflections.ReflectionUtils.forNames(ReflectionUtils.java:398)
 at org.reflections.Reflections.getTypesAnnotatedWith(Reflections.java:385)
 at org.reflections.Reflections.getTypesAnnotatedWith(Reflections.java:370)
 at com.mycompany.xxx.xxxxxxxxxxxxxxxx
 at com.mycompany.xxxxxxxxxxxxxxxx
 at com.mycompany.xxx.xxxxxxxxxxxxxxxx
 at io.dropwizard.Application.run(Application.java:70)
 at com.mycompany.xxx.xxxxxxxxxxxxxxxx
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:606)
 at javassist.Loader.run(Loader.java:291)
 at com.mycompany.xxx.xxxxxxxxxxxxxxxx
 at com.mycompany.xxx.xxxxxxxxxxxxxxxx
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:606)
 at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

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Javassist version: 3.18.2-GA
Java version: Java 1.7
AccountProduct java class (with default non-customer specific member variables):
private Account account;
private Integer accountId;
private Product product;
private Integer productId;
private Date createdAt; 
private Date updatedAt;
private Key id;

Is it JVM memory related issue or is it javaassist related issue? Can anybody aware or know of this issue? Any insights? Thanks in advance