CODEWITHSUNDEEP
javagoogle-app-engine
sathya
sathya

Reputation: 384

Why am getting an error cannot parse the key in google app engine for java

I had tried with the below way and got failed,

Query query = new Query("Users");
List<Entity> results = datastore.prepare(query).asList(FetchOptions.Builder.withLimit(PAGE_SIZE));
for (Entity user : results){
Key key = user.getKey();
System.out.println(key); // here am getting as Users(151),Users(152)...

From here am passing the "Key" as request parameter to a servlet.

In My Servlet,

String keyString = req.getParameter("key");
Key key = KeyFactory.stringToKey(keyString);
datastore.delete(key);

the error says "Cannot parse: Users(151)==" and the line of error is " Key key = KeyFactory.stringToKey(keyString);"

Can anyone suggest me an idea,

Your help will be appreciated.

Upvotes: 0

Views: 680

Answers (1)

Peter Knego
Peter Knego

Reputation: 80340

Instead of passing Key as java objects to servlet, you should use this snippet to serialize

String encodedKey = KeyFactory.keyToString(key)

and this to deserialize

Key key = KeyFactory.stringToKey(encodedKey)

Upvotes: 2

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