ArrayIndexOutOfBoundsException when model object add a new field

[xc s]

Hello,

I run two spring application: app1 & app2, model object cached share in redis. 

Then I add a new field to model object and upgrade app2 and fresh model object cache.

Now I load model object in app1, will throw ArrayIndexOutOfBoundsException, like this:

java.lang.ArrayIndexOutOfBoundsException: 22
at io.ebean.bean.EntityBeanIntercept.isLoadedProperty(EntityBeanIntercept.java:547)
at io.ebean.bean.EntityBeanIntercept.preGetter(EntityBeanIntercept.java:938)

How to avoid this issue? I think may be return null if  index is over the array.

My ebean version is 12.1.8.

Thanks

Xc

[Rob Bygrave]

You might want to create a test case?

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[xc s]

Thanks for your reply.

I use fast-serialization mock all case, save model object to file, then read it deserialization as object.

Step 1  Write

1.1 Model

@Entity
public class TestModel {
    public static Finder<Integer, TestModel> finder = new Finder<>(TestModel.class);
    @Id
    Integer id;
    String field1;
    ...
}

1.2 Write object to file

FSTConfiguration fst = FSTConfiguration.createDefaultConfiguration(); 

Path target = Paths.get("model_v1.log");
TestModel model = TestModel.finder.byId(id);
byte[] bb = fst.asByteArray(model);
Files.write(target, bb); 

Step 2 Read

2.1 Then add a field to model

@Entity
public class TestModel {
    public static Finder<Integer, TestModel> finder = new Finder<>(TestModel.class, ChargeToolApplication.DB_NAME);
    @Id
    Integer id;
    String field1;
    @org.nustaq.serialization.annotations.Version(1)
    String field2;

    ...
}

2.2 Read old data 

FSTConfiguration fst = FSTConfiguration.createDefaultConfiguration();
Path target = Paths.get("model_v1.log");
byte[] bb = Files.readAllBytes(target);
TestModel model = (TestModel) fst.asObject(bb);
System.out.println(model.getField1());
System.out.println(model.getField2()); // --> it will throw Exception

Exception stack

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2

at io.ebean.bean.EntityBeanIntercept.isLoadedProperty(EntityBeanIntercept.java:547)
at io.ebean.bean.EntityBeanIntercept.preGetter(EntityBeanIntercept.java:938)

at soda.charge.tool.vm.TestModel._ebean_get_field2(TestModel.java:6)
at soda.charge.tool.vm.TestModel.getField2(TestModel.java:41) 

 

I can't simple upgrade a online application for this exception, so maybe cache a ebean model is not good choose?  or maybe get a null value for model.getFields2().  

在 2020年5月20日星期三 UTC+8下午4:51:07，Rob Bygrave写道：

You might want to create a test case?

On Wed, 20 May 2020 at 01:39, xc s <pep...@gmail.com> wrote:

Hello,

I run two spring application: app1 & app2, model object cached share in redis. 

Then I add a new field to model object and upgrade app2 and fresh model object cache.

Now I load model object in app1, will throw ArrayIndexOutOfBoundsException, like this:

java.lang.ArrayIndexOutOfBoundsException: 22
at io.ebean.bean.EntityBeanIntercept.isLoadedProperty(EntityBeanIntercept.java:547)
at io.ebean.bean.EntityBeanIntercept.preGetter(EntityBeanIntercept.java:938)

How to avoid this issue? I think may be return null if  index is over the array.

My ebean version is 12.1.8.

Thanks

Xc

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