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Posted to dev@mahout.apache.org by "Vishnu (JIRA)" <ji...@apache.org> on 2011/09/07 17:56:10 UTC
[jira] [Created] (MAHOUT-801) MongoDBDataModel getID() throws a
class cast exception
MongoDBDataModel getID() throws a class cast exception
-------------------------------------------------------
Key: MAHOUT-801
URL: https://issues.apache.org/jira/browse/MAHOUT-801
Project: Mahout
Issue Type: Bug
Components: Integration
Affects Versions: 0.6
Reporter: Vishnu
I imported GroupLense ratings.dat to a mongodb collection "ratings" using mongoimport
Output of db.ratings.find() query
"_id" : ObjectId("4e6733621497ef8543c1e144"), "userId" : 1, "movieId" : 1193, "rating" : 5, "timestamp" : NumberLong(978300760)
"_id" : ObjectId("4e6733621497ef8543c1e145"), "userId" : 1, "movieId" : 661, "rating" : 3, "timestamp" : NumberLong(978302109)
"_id" : ObjectId("4e6733621497ef8543c1e146"), "userId" : 1, "movieId" : 914, "rating" : 3, "timestamp" : NumberLong(978301968)
"_id" : ObjectId("4e6733621497ef8543c1e147"), "userId" : 1, "movieId" : 3408, "rating" : 4, "timestamp" : NumberLong(978300275)
"_id" : ObjectId("4e6733621497ef8543c1e148"), "userId" : 1, "movieId" : 2355, "rating" : 5, "timestamp" : NumberLong(978824291)
Spring Bean creating MongoDBDataModel instance
{code}
<bean id="mongodbDataModel" class="org.apache.mahout.cf.taste.impl.model.mongodb.MongoDBDataModel">
<constructor-arg index="0" type="java.lang.String" value="127.0.0.1"/>
<constructor-arg index="1" type="int" value="27017"/>
<constructor-arg index="2" type="java.lang.String" value="grouplens"/>
<constructor-arg index="3" type="java.lang.String" value="ratings" />
<constructor-arg index="4" type="boolean" value="false"/>
<constructor-arg index="5" type="boolean" value="false"/>
<constructor-arg index="6" type="java.text.DateFormat" value="#{ null }"/>
<constructor-arg index="7" type="java.lang.String" value="user"/>
<constructor-arg index="8" type="java.lang.String" value="password"/>
<constructor-arg index="9" type="java.lang.String" value="userId"/>
<constructor-arg index="10" type="java.lang.String" value="movieId"/>
<constructor-arg index="11" type="java.lang.String" value="rating"/>
</bean>
{code}
When MongDBDataModel loads the rating from mongdb, method getID() throws ClassCastException
{code}
Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
at org.apache.mahout.cf.taste.impl.model.mongodb.MongoDBDataModel.getID(MongoDBDataModel.java:742)
at org.apache.mahout.cf.taste.impl.model.mongodb.MongoDBDataModel.buildModel(MongoDBDataModel.java:564)
at org.apache.mahout.cf.taste.impl.model.mongodb.MongoDBDataModel.<init>(MongoDBDataModel.java:347)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
{code}
Exception is being thrown by last return statement "return (String) id;"
{code}
private String getID(Object id, boolean isUser) {
if (id.getClass().getName().contains("ObjectId")) {
if (isUser) {
userIsObject = true;
} else {
itemIsObject = true;
}
return ((ObjectId) id).toStringMongod();
} else {
return (String) id;
}
}
{code}
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[jira] [Commented] (MAHOUT-801) MongoDBDataModel getID() throws a
class cast exception
Posted by "Hudson (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAHOUT-801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13102817#comment-13102817 ]
Hudson commented on MAHOUT-801:
-------------------------------
Integrated in Mahout-Quality #1032 (See [https://builds.apache.org/job/Mahout-Quality/1032/])
MAHOUT-801 avoid some ClassCastException by preferring toString()
srowen : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1169784
Files :
* /mahout/trunk/integration/src/main/java/org/apache/mahout/cf/taste/impl/model/mongodb/MongoDBDataModel.java
> MongoDBDataModel getID() throws a class cast exception
> -------------------------------------------------------
>
> Key: MAHOUT-801
> URL: https://issues.apache.org/jira/browse/MAHOUT-801
> Project: Mahout
> Issue Type: Bug
> Components: Integration
> Affects Versions: 0.6
> Reporter: Vishnu
> Assignee: Sean Owen
> Fix For: 0.6
>
>
> I imported GroupLense ratings.dat to a mongodb collection "ratings" using mongoimport
> Output of db.ratings.find() query
> "_id" : ObjectId("4e6733621497ef8543c1e144"), "userId" : 1, "movieId" : 1193, "rating" : 5, "timestamp" : NumberLong(978300760)
> "_id" : ObjectId("4e6733621497ef8543c1e145"), "userId" : 1, "movieId" : 661, "rating" : 3, "timestamp" : NumberLong(978302109)
> "_id" : ObjectId("4e6733621497ef8543c1e146"), "userId" : 1, "movieId" : 914, "rating" : 3, "timestamp" : NumberLong(978301968)
> "_id" : ObjectId("4e6733621497ef8543c1e147"), "userId" : 1, "movieId" : 3408, "rating" : 4, "timestamp" : NumberLong(978300275)
> "_id" : ObjectId("4e6733621497ef8543c1e148"), "userId" : 1, "movieId" : 2355, "rating" : 5, "timestamp" : NumberLong(978824291)
> Spring Bean creating MongoDBDataModel instance
> {code}
> <bean id="mongodbDataModel" class="org.apache.mahout.cf.taste.impl.model.mongodb.MongoDBDataModel">
> <constructor-arg index="0" type="java.lang.String" value="127.0.0.1"/>
> <constructor-arg index="1" type="int" value="27017"/>
> <constructor-arg index="2" type="java.lang.String" value="grouplens"/>
> <constructor-arg index="3" type="java.lang.String" value="ratings" />
> <constructor-arg index="4" type="boolean" value="false"/>
> <constructor-arg index="5" type="boolean" value="false"/>
> <constructor-arg index="6" type="java.text.DateFormat" value="#{ null }"/>
> <constructor-arg index="7" type="java.lang.String" value="user"/>
> <constructor-arg index="8" type="java.lang.String" value="password"/>
> <constructor-arg index="9" type="java.lang.String" value="userId"/>
> <constructor-arg index="10" type="java.lang.String" value="movieId"/>
> <constructor-arg index="11" type="java.lang.String" value="rating"/>
> </bean>
> {code}
> When MongDBDataModel loads the rating from mongdb, method getID() throws ClassCastException
> {code}
> Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
> at org.apache.mahout.cf.taste.impl.model.mongodb.MongoDBDataModel.getID(MongoDBDataModel.java:742)
> at org.apache.mahout.cf.taste.impl.model.mongodb.MongoDBDataModel.buildModel(MongoDBDataModel.java:564)
> at org.apache.mahout.cf.taste.impl.model.mongodb.MongoDBDataModel.<init>(MongoDBDataModel.java:347)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> {code}
> Exception is being thrown by last return statement "return (String) id;"
> {code}
> private String getID(Object id, boolean isUser) {
> if (id.getClass().getName().contains("ObjectId")) {
> if (isUser) {
> userIsObject = true;
> } else {
> itemIsObject = true;
> }
> return ((ObjectId) id).toStringMongod();
> } else {
> return (String) id;
> }
> }
> {code}
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[jira] [Resolved] (MAHOUT-801) MongoDBDataModel getID() throws a
class cast exception
Posted by "Sean Owen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAHOUT-801?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Owen resolved MAHOUT-801.
------------------------------
Resolution: Fixed
Fix Version/s: 0.6
Assignee: Sean Owen
I changed all occurrences of a String cast to use toString(), with proper null checking of course.
> MongoDBDataModel getID() throws a class cast exception
> -------------------------------------------------------
>
> Key: MAHOUT-801
> URL: https://issues.apache.org/jira/browse/MAHOUT-801
> Project: Mahout
> Issue Type: Bug
> Components: Integration
> Affects Versions: 0.6
> Reporter: Vishnu
> Assignee: Sean Owen
> Fix For: 0.6
>
>
> I imported GroupLense ratings.dat to a mongodb collection "ratings" using mongoimport
> Output of db.ratings.find() query
> "_id" : ObjectId("4e6733621497ef8543c1e144"), "userId" : 1, "movieId" : 1193, "rating" : 5, "timestamp" : NumberLong(978300760)
> "_id" : ObjectId("4e6733621497ef8543c1e145"), "userId" : 1, "movieId" : 661, "rating" : 3, "timestamp" : NumberLong(978302109)
> "_id" : ObjectId("4e6733621497ef8543c1e146"), "userId" : 1, "movieId" : 914, "rating" : 3, "timestamp" : NumberLong(978301968)
> "_id" : ObjectId("4e6733621497ef8543c1e147"), "userId" : 1, "movieId" : 3408, "rating" : 4, "timestamp" : NumberLong(978300275)
> "_id" : ObjectId("4e6733621497ef8543c1e148"), "userId" : 1, "movieId" : 2355, "rating" : 5, "timestamp" : NumberLong(978824291)
> Spring Bean creating MongoDBDataModel instance
> {code}
> <bean id="mongodbDataModel" class="org.apache.mahout.cf.taste.impl.model.mongodb.MongoDBDataModel">
> <constructor-arg index="0" type="java.lang.String" value="127.0.0.1"/>
> <constructor-arg index="1" type="int" value="27017"/>
> <constructor-arg index="2" type="java.lang.String" value="grouplens"/>
> <constructor-arg index="3" type="java.lang.String" value="ratings" />
> <constructor-arg index="4" type="boolean" value="false"/>
> <constructor-arg index="5" type="boolean" value="false"/>
> <constructor-arg index="6" type="java.text.DateFormat" value="#{ null }"/>
> <constructor-arg index="7" type="java.lang.String" value="user"/>
> <constructor-arg index="8" type="java.lang.String" value="password"/>
> <constructor-arg index="9" type="java.lang.String" value="userId"/>
> <constructor-arg index="10" type="java.lang.String" value="movieId"/>
> <constructor-arg index="11" type="java.lang.String" value="rating"/>
> </bean>
> {code}
> When MongDBDataModel loads the rating from mongdb, method getID() throws ClassCastException
> {code}
> Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
> at org.apache.mahout.cf.taste.impl.model.mongodb.MongoDBDataModel.getID(MongoDBDataModel.java:742)
> at org.apache.mahout.cf.taste.impl.model.mongodb.MongoDBDataModel.buildModel(MongoDBDataModel.java:564)
> at org.apache.mahout.cf.taste.impl.model.mongodb.MongoDBDataModel.<init>(MongoDBDataModel.java:347)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> {code}
> Exception is being thrown by last return statement "return (String) id;"
> {code}
> private String getID(Object id, boolean isUser) {
> if (id.getClass().getName().contains("ObjectId")) {
> if (isUser) {
> userIsObject = true;
> } else {
> itemIsObject = true;
> }
> return ((ObjectId) id).toStringMongod();
> } else {
> return (String) id;
> }
> }
> {code}
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[jira] [Commented] (MAHOUT-801) MongoDBDataModel getID() throws a
class cast exception
Posted by "Fernando Tapia Rico (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAHOUT-801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13102669#comment-13102669 ]
Fernando Tapia Rico commented on MAHOUT-801:
--------------------------------------------
Hi Vishnu,
I think this change should work:
{code:java}
return (String) id;
{code}
{code:java}
return id.toString();
{code}
> MongoDBDataModel getID() throws a class cast exception
> -------------------------------------------------------
>
> Key: MAHOUT-801
> URL: https://issues.apache.org/jira/browse/MAHOUT-801
> Project: Mahout
> Issue Type: Bug
> Components: Integration
> Affects Versions: 0.6
> Reporter: Vishnu
>
> I imported GroupLense ratings.dat to a mongodb collection "ratings" using mongoimport
> Output of db.ratings.find() query
> "_id" : ObjectId("4e6733621497ef8543c1e144"), "userId" : 1, "movieId" : 1193, "rating" : 5, "timestamp" : NumberLong(978300760)
> "_id" : ObjectId("4e6733621497ef8543c1e145"), "userId" : 1, "movieId" : 661, "rating" : 3, "timestamp" : NumberLong(978302109)
> "_id" : ObjectId("4e6733621497ef8543c1e146"), "userId" : 1, "movieId" : 914, "rating" : 3, "timestamp" : NumberLong(978301968)
> "_id" : ObjectId("4e6733621497ef8543c1e147"), "userId" : 1, "movieId" : 3408, "rating" : 4, "timestamp" : NumberLong(978300275)
> "_id" : ObjectId("4e6733621497ef8543c1e148"), "userId" : 1, "movieId" : 2355, "rating" : 5, "timestamp" : NumberLong(978824291)
> Spring Bean creating MongoDBDataModel instance
> {code}
> <bean id="mongodbDataModel" class="org.apache.mahout.cf.taste.impl.model.mongodb.MongoDBDataModel">
> <constructor-arg index="0" type="java.lang.String" value="127.0.0.1"/>
> <constructor-arg index="1" type="int" value="27017"/>
> <constructor-arg index="2" type="java.lang.String" value="grouplens"/>
> <constructor-arg index="3" type="java.lang.String" value="ratings" />
> <constructor-arg index="4" type="boolean" value="false"/>
> <constructor-arg index="5" type="boolean" value="false"/>
> <constructor-arg index="6" type="java.text.DateFormat" value="#{ null }"/>
> <constructor-arg index="7" type="java.lang.String" value="user"/>
> <constructor-arg index="8" type="java.lang.String" value="password"/>
> <constructor-arg index="9" type="java.lang.String" value="userId"/>
> <constructor-arg index="10" type="java.lang.String" value="movieId"/>
> <constructor-arg index="11" type="java.lang.String" value="rating"/>
> </bean>
> {code}
> When MongDBDataModel loads the rating from mongdb, method getID() throws ClassCastException
> {code}
> Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
> at org.apache.mahout.cf.taste.impl.model.mongodb.MongoDBDataModel.getID(MongoDBDataModel.java:742)
> at org.apache.mahout.cf.taste.impl.model.mongodb.MongoDBDataModel.buildModel(MongoDBDataModel.java:564)
> at org.apache.mahout.cf.taste.impl.model.mongodb.MongoDBDataModel.<init>(MongoDBDataModel.java:347)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> {code}
> Exception is being thrown by last return statement "return (String) id;"
> {code}
> private String getID(Object id, boolean isUser) {
> if (id.getClass().getName().contains("ObjectId")) {
> if (isUser) {
> userIsObject = true;
> } else {
> itemIsObject = true;
> }
> return ((ObjectId) id).toStringMongod();
> } else {
> return (String) id;
> }
> }
> {code}
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