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https://issues.apache.org/jira/browse/AVRO-1166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13456165#comment-13456165
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Amine R. commented on AVRO-1166:
--------------------------------
Adding debug information when the {{org.apache.avro.AvroTypeException: Map key
class not CharSequence: class java.lang.String}} gets thrown:
{code}
this = {org.apache.avro.specific.SpecificData@2754}
type =
{sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl@2760}"java.util.Map<java.lang.String,
com.foo.bar.MyObject>"
names = {java.util.LinkedHashMap@2761} size = 0
ptype =
{sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl@2760}"java.util.Map<java.lang.String,
com.foo.bar.MyObject>"
raw = {java.lang.Class@2762}"interface java.util.Map"
params = {java.lang.reflect.Type[2]@2763}
key = {java.lang.Class@2764}"class java.lang.String"
value = {java.lang.Class@2451}"class com.foo.bar.MyObject"
params[1] = {java.lang.Class@2451}"class com.foo.bar.MyObject"
{code}
> IDL return type of map<record> fails in schema processing
> ---------------------------------------------------------
>
> Key: AVRO-1166
> URL: https://issues.apache.org/jira/browse/AVRO-1166
> Project: Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.7.1
> Reporter: George Fletcher
>
> An IDL construct such as ...
> {code:title=Foo.idl}
> protocol MyService {
> record Bar {
> int count;
> string message;
> }
> map<Bar> getBars();
> }
> {code}
> generates run-time errors because of this code in SpecificData.java
> {code:title=SpecificData.java lines 189-196}
> } else if (Map.class.isAssignableFrom(raw)) { // map
> java.lang.reflect.Type key = params[0];
> java.lang.reflect.Type value = params[1];
> if (!(type instanceof Class
> && CharSequence.class.isAssignableFrom((Class)type)))
> throw new AvroTypeException("Map key class not CharSequence: "+key);
> return Schema.createMap(createSchema(value, names));
> } else {
> {code}
> the issue is that CharSequence.class.isAssignableFrom((Class)type)) should
> really be CharSequence.class.isAssignableFrom((Class)*key*))
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