title: Android - how to get json from retrofit
body: <p>I am new with Retrofit, </p>
  
  <pre><code> [
    {
      "scheme_name": "DSP BlackRock Tax Saver Fund (G)",
      "sch_id": "401",
      "scheme_code": "D110",
      "category_type": "Equity",
      "trxntype": "Lumpsum",
      "current_value": 570.178,
      "folio_no": "3417548/62",
      "units": 14.941,
      "trnx_date": "10-06-16",
      "current_invest": 500,
      "gainLoss": 70.18
    },
    {
      "scheme_name": "DSP BlackRock World Mining Fund  (G)",
      "sch_id": "1278",
      "scheme_code": "D341",
      "category_type": "Equity",
      "trxntype": "Lumpsum",
      "current_value": 1999.393,
      "folio_no": "3417548/62",
      "units": 302.16,
      "trnx_date": "21-07-16",
      "current_invest": 2000,
      "gainLoss": -0.61
    },
    {
      "scheme_name": "ICICI Prudential Savings Fund (G)",
      "sch_id": "119",
      "scheme_code": "P1543",
      "category_type": "Debt",
      "trxntype": "Full Redemption",
      "current_value": 0,
      "folio_no": "8349201/28",
      "units": 0,
      "trnx_date": "19-07-16",
      "current_invest": 0,
      "gainLoss": 0
    },
    {
      "scheme_name": "Kotak Emerging Equity Scheme (G)",
      "sch_id": "1001",
      "scheme_code": "K123",
      "category_type": "Equity",
      "trxntype": "Lumpsum",
      "current_value": 10309.489,
      "folio_no": "3625427/38",
      "units": 325.796,
      "trnx_date": "03-08-16",
      "current_invest": 10000,
      "gainLoss": 309.49
    }
  ]
  </code></pre>
  
  <p>this is json is get, </p>
  
  <pre><code> package info.androidhive.retrofit.model;
  import com.google.gson.annotations.Expose;
  import com.google.gson.annotations.SerializedName;
  
  import javax.annotation.Generated;
  
  @Generated("org.jsonschema2pojo")
  public class MyTransaction {
  
      @SerializedName("scheme_name")
      @Expose
      private String schemeName;
      @SerializedName("sch_id")
      @Expose
      private String schId;
      @SerializedName("scheme_code")
      @Expose
      private String schemeCode;
      @SerializedName("category_type")
      @Expose
      private String categoryType;
      @SerializedName("trxntype")
      @Expose
      private String trxntype;
      @SerializedName("current_value")
      @Expose
      private Float currentValue;
      @SerializedName("folio_no")
      @Expose
      private String folioNo;
      @SerializedName("units")
      @Expose
      private Float units;
      @SerializedName("trnx_date")
      @Expose
      private String trnxDate;
      @SerializedName("current_invest")
      @Expose
      private Integer currentInvest;
      @SerializedName("gainLoss")
      @Expose
      private Float gainLoss;
  
  
  
      public MyTransaction(String schemeName, String schId, String schemeCode, String categoryType, String trxntype, Float currentValue, String folioNo, Float units, String trnxDate, Integer currentInvest, Float gainLoss) {
          this.schemeName = schemeName;
          this.schId = schId;
          this.schemeCode = schemeCode;
          this.categoryType = categoryType;
          this.trxntype = trxntype;
          this.currentValue = currentValue;
          this.folioNo = folioNo;
          this.units = units;
          this.trnxDate = trnxDate;
          this.currentInvest = currentInvest;
          this.gainLoss = gainLoss;
      }
  
  
  
      /**
       *
       * @return
       * The schemeName
       */
      public String getSchemeName() {
          return schemeName;
      }
  
      /**
       *
       * @param schemeName
       * The scheme_name
       */
      public void setSchemeName(String schemeName) {
          this.schemeName = schemeName;
      }
  
      /**
       *
       * @return
       * The schId
       */
      public String getSchId() {
          return schId;
      }
  
      /**
       *
       * @param schId
       * The sch_id
       */
      public void setSchId(String schId) {
          this.schId = schId;
      }
  
      /**
       *
       * @return
       * The schemeCode
       */
      public String getSchemeCode() {
          return schemeCode;
      }
  
      /**
       *
       * @param schemeCode
       * The scheme_code
       */
      public void setSchemeCode(String schemeCode) {
          this.schemeCode = schemeCode;
      }
  
      /**
       *
       * @return
       * The categoryType
       */
      public String getCategoryType() {
          return categoryType;
      }
  
      /**
       *
       * @param categoryType
       * The category_type
       */
      public void setCategoryType(String categoryType) {
          this.categoryType = categoryType;
      }
  
      /**
       *
       * @return
       * The trxntype
       */
      public String getTrxntype() {
          return trxntype;
      }
  
      /**
       *
       * @param trxntype
       * The trxntype
       */
      public void setTrxntype(String trxntype) {
          this.trxntype = trxntype;
      }
  
      /**
       *
       * @return
       * The currentValue
       */
      public Float getCurrentValue() {
          return currentValue;
      }
  
      /**
       *
       * @param currentValue
       * The current_value
       */
      public void setCurrentValue(Float currentValue) {
          this.currentValue = currentValue;
      }
  
      /**
       *
       * @return
       * The folioNo
       */
      public String getFolioNo() {
          return folioNo;
      }
  
      /**
       *
       * @param folioNo
       * The folio_no
       */
      public void setFolioNo(String folioNo) {
          this.folioNo = folioNo;
      }
  
      /**
       *
       * @return
       * The units
       */
      public Float getUnits() {
          return units;
      }
  
      /**
       *
       * @param units
       * The units
       */
      public void setUnits(Float units) {
          this.units = units;
      }
  
      /**
       *
       * @return
       * The trnxDate
       */
      public String getTrnxDate() {
          return trnxDate;
      }
  
      /**
       *
       * @param trnxDate
       * The trnx_date
       */
      public void setTrnxDate(String trnxDate) {
          this.trnxDate = trnxDate;
      }
  
      /**
       *
       * @return
       * The currentInvest
       */
      public Integer getCurrentInvest() {
          return currentInvest;
      }
  
      /**
       *
       * @param currentInvest
       * The current_invest
       */
      public void setCurrentInvest(Integer currentInvest) {
          this.currentInvest = currentInvest;
      }
  
      /**
       *
       * @return
       * The gainLoss
       */
      public Float getGainLoss() {
          return gainLoss;
      }
  
      /**
       *
       * @param gainLoss
       * The gainLoss
       */
      public void setGainLoss(Float gainLoss) {
          this.gainLoss = gainLoss;
      }
  
  }
  </code></pre>
  
  <p>Above is model class.
  Api Client code</p>
  
  <pre><code>    public static final String BASE_URL = "http://www.mysiponline.com/admin-panel/AndroidApi/";
      private static Retrofit retrofit = null;
  
      public static Retrofit getClient() {
          if (retrofit==null) {
              retrofit = new Retrofit.Builder()
                      .baseUrl(BASE_URL)
                      .addConverterFactory(GsonConverterFactory.create())
                      .build();
          }
          return retrofit;
      }
  </code></pre>
  
  <p>AIPinterfae code </p>
  
  <pre><code>     @POST("client_trans/{user_id}")
      Call&lt;MyTransaction&gt; getTransaction(@Path("user_id") String id);
  </code></pre>
  
  <p>MainActivity code</p>
  
  <pre><code>    Call&lt;MyTransaction&gt; myTransactionCall = apiService.getTransaction("420");
          myTransactionCall.enqueue(new Callback&lt;MyTransaction&gt;() {
              @Override
              public void onResponse(Call&lt;MyTransaction&gt; call, Response&lt;MyTransaction&gt; response) {
  
                  Log.e(TAG, "Partners list : response.body());
              }
  
              @Override
              public void onFailure(Call&lt;MyTransaction&gt; call, Throwable t) {
  
              }
          });
  </code></pre>
  
  <p>In mainActivity code getting error. I am not able to get it. Please help and thanks in advance.</p>
  
  <pre><code>E/AndroidRuntime: FATAL EXCEPTION: main
  java.lang.NullPointerException
  at info.androidhive.retrofit.activity.MainActivity$2.onResponse(MainActivity.java:65)
  at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:68)
  at android.os.Handler.handleCallback(Handler.java:615)
  at android.os.Handler.dispatchMessage(Handler.java:92)
  at android.os.Looper.loop(Looper.java:137)
  at android.app.ActivityThread.main(ActivityThread.java:4745)
  at java.lang.reflect.Method.invokeNative(Native Method)
  at java.lang.reflect.Method.invoke(Method.java:511)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
  at dalvik.system.NativeStart.main(Native Method)
  </code></pre>