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    <p>Your last query fails in the mongo driver in a sense that the update has no effect - but it's not an actual error. Just let me reproduce what you are doing in the mongo shell:</p> <pre><code>&gt; db.coll.insert({_id:1,name:"name1"}) &gt; db.coll.update({name:"name1"}, {"$push": {dependents: {name:"a", age:50}}}) &gt; db.coll.update({name:"name1"}, {"$push": {dependents: {name:"b", age:55}}}) &gt; db.coll.findOne() { "_id" : 1, "dependents" : [ { "name" : "a", "age" : 50 }, { "name" : "b", "age" : 55 } ], "name" : "name1" } &gt; db.coll.update({"dependents.name": "a"}, {"$push": {"dependents.dep_children": {name:"aa"}}}) can't append to array using string field name: dep_children &gt; db.coll.update({"dependents.name": "a"}, {"$push": {"dependents.$.dep_children": {name:"aa"}}}) &gt; db.coll.findOne() { "_id" : 1, "dependents" : [ { "age" : 50, "dep_children" : [ { "name" : "aa" } ], "name" : "a" }, { "name" : "b", "age" : 55 } ], "name" : "name1" } </code></pre> <p>Unfortunately, I have very little experience with the native mongo java driver (I'm usually on Spring data), but changing your line</p> <pre><code>updatekid.put("$push", new BasicDBObject("dependent.dep_children",tenantkid)); </code></pre> <p>to</p> <pre><code>updatekid.put("$push", new BasicDBObject("dependent.$.dep_children",tenantkid)); </code></pre> <p>should do the trick as well.</p> <p>The reason for that behavior is that "dependent.dep_children" is not a valid selector as it corresponds to "go to field dep_children within the subdocument dependent". However, "dependent" happens to be an array without any fields. The $ replaces an explicit index and will make sure the correct subdocument from your query is selected.</p> <p>Also see <a href="https://stackoverflow.com/questions/6758339/updating-embedded-document-property-in-mongodb?rq=1">here</a> for a less error-prone formulation of your query - without using $elemMatch it will only work if your query uniquely identifies a certain array element. With $elemMatch it will always work, but only update the first match.</p>
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    1. COThank u so much.. it worked.......
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