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PONull pointer exception when trying to fetch all documents from CouchDB database using ektorp on Android
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  1. PONull pointer exception when trying to fetch all documents from CouchDB database using ektorp on Android
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    copied!<p>I have simple item model with name and quantity:</p> <pre><code>public class Item extends CouchDbDocument{ private static final long serialVersionUID = -3645214415410443346L; private String name; private int quantity; public Item (String name, int qty){ this.name = name; this.quantity = qty; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getQuantity() { return quantity; } public void setQuantity(int quantity) { this.quantity = quantity; } } </code></pre> <p>and an Item Repository class</p> <pre><code>public class ItemRepository extends CouchDbRepositorySupport&lt;Item&gt;{ public ItemRepository(CouchDbConnector db) { super(Item.class, db); initStandardDesignDocument(); } @GenerateView @Override public List&lt;Item&gt; getAll() { ViewQuery q = createQuery("all").descending(true); return db.queryView(q, Item.class); } </code></pre> <p>and an Item Controller</p> <pre><code>public class ItemController { ItemRepository itemRepository; public String viewAll() { List&lt;Item&gt; items = itemRepository.getAll(); return items.toString(); } } </code></pre> <p>I have a CouchDBConnector class which is added as javascript interface:</p> <pre><code>public class CouchDBConnector { private WebView webView; private DroidGap droidGap; private CouchDbConnector db ; private CouchDbInstance dbInstance; private ItemController itemController; private ItemRepository repo; public CouchDBConnector(DroidGap gap, WebView view) { this.webView = view; this.droidGap = gap; } public void init(){ HttpClient httpClient = new StdHttpClient.Builder() .host("localhost") .port(5984) .build(); dbInstance = new StdCouchDbInstance(httpClient); db = new StdCouchDbConnector("itemdatabase", dbInstance); repo = new ItemRepository(db); itemController = new ItemController(); } public String getAllItems(){ String prefix = "Items \n"; return prefix + repo.getAll().toString(); } public void add(String item_name, String qty){ repo.add(new Item(item_name, Integer.parseInt(qty))); return; } public void update(String item_name, String qty){ repo.update(new Item(item_name, Integer.parseInt(qty))); return; } public void delete(String item_name, String qty){ repo.remove(new Item(item_name, Integer.parseInt(qty))); return; } } </code></pre> <p>From the HTML page of the PhoneGap app, I am trying to call <code>CouchDBConnector</code> class to get all the documents or a string "No Items found" but I get null pointer exceptions. Here's the stack trace:</p> <pre><code>`12-14 16:12:45.273: I/dalvikvm(675): java.lang.NullPointerException: 12-14 16:12:45.273: I/dalvikvm(675): at com.phonegap.TestDB.CouchDBConnector.getAllItems(CouchDBConnector.java:44) 12-14 16:12:45.273: I/dalvikvm(675): at android.webkit.JWebCoreJavaBridge.nativeServiceFuncPtrQueue(Native Method) 12-14 16:12:45.273: I/dalvikvm(675): at android.webkit.JWebCoreJavaBridge.nativeServiceFuncPtrQueue(Native Method) 12-14 16:12:45.273: I/dalvikvm(675): at android.webkit.JWebCoreJavaBridge.handleMessage(JWebCoreJavaBridge.java:115) 12-14 16:12:45.273: I/dalvikvm(675): at android.os.Handler.dispatchMessage(Handler.java:99) 12-14 16:12:45.273: I/dalvikvm(675): at android.os.Looper.loop(Looper.java:137) 12-14 16:12:45.273: I/dalvikvm(675): at android.webkit.WebViewCore$WebCoreThread.run(WebViewCore.java:722) 12-14 16:12:45.283: I/dalvikvm(675): at java.lang.Thread.run(Thread.java:856) 12-14 16:12:45.293: I/dalvikvm(675): "WebViewCoreThread" prio=5 tid=11 NATIVE 12-14 16:12:45.303: I/dalvikvm(675): | group="main" sCount=0 dsCount=0 obj=0x41381ca0 self=0x1dbf90 12-14 16:12:45.303: I/dalvikvm(675): | sysTid=688 nice=0 sched=0/0 cgrp=default handle=1748120 12-14 16:12:45.312: I/dalvikvm(675): | schedstat=( 3460347960 1824920390 1206 ) utm=321 stm=24 core=0 12-14 16:12:45.312: I/dalvikvm(675): at android.webkit.JWebCoreJavaBridge.nativeServiceFuncPtrQueue(Native Method) 12-14 16:12:45.312: I/dalvikvm(675): at android.webkit.JWebCoreJavaBridge.nativeServiceFuncPtrQueue(Native Method) 12-14 16:12:45.323: I/dalvikvm(675): at android.webkit.JWebCoreJavaBridge.handleMessage(JWebCoreJavaBridge.java:115) 12-14 16:12:45.323: I/dalvikvm(675): at android.os.Handler.dispatchMessage(Handler.java:99) 12-14 16:12:45.323: I/dalvikvm(675): at android.os.Looper.loop(Looper.java:137) 12-14 16:12:45.333: I/dalvikvm(675): at android.webkit.WebViewCore$WebCoreThread.run(WebViewCore.java:722) 12-14 16:12:45.343: I/dalvikvm(675): at java.lang.Thread.run(Thread.java:856) </code></pre>
 

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