src/test/java/com/fasterxml/jackson/databind/exc/DeserExceptionTypeTest.java

package com.fasterxml.jackson.databind.exc;

import java.io.*;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.exc.MismatchedInputException;
import com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException;

/**
 * Unit test for verifying that exceptions are properly handled (caught,
 * re-thrown or wrapped, depending) with Object deserialization,
 * including using concrete subtypes of {@link JsonMappingException}
 * (or, for low-level parsing, {@link JsonParseException}).
 */
public class DeserExceptionTypeTest
    extends BaseMapTest
{
    static class Bean {
        public String propX;
    }

    // Class that has no applicable creators and thus cannot be instantiated;
    // definition problem
    static class NoCreatorsBean {
        public int x;

        // Constructor that is not detectable as Creator
        public NoCreatorsBean(boolean foo, int foo2) { }
    }
    
    /*
    /**********************************************************
    /* Test methods
    /**********************************************************
     */

    private final ObjectMapper MAPPER = new ObjectMapper();
    
    public void testHandlingOfUnrecognized() throws Exception
    {
        UnrecognizedPropertyException exc = null;
        try {
            MAPPER.readValue("{\"bar\":3}", Bean.class);
        } catch (UnrecognizedPropertyException e) {
            exc = e;
        }
        if (exc == null) {
            fail("Should have failed binding");
        }
        assertEquals("bar", exc.getPropertyName());
        assertEquals(Bean.class, exc.getReferringClass());
        // also: should get list of known properties
        verifyException(exc, "propX");
    }

    /**
     * Simple test to check behavior when end-of-stream is encountered
     * without content. Used to expect EOFException (Jackson 1.x); but
     * nowadays ought to be JsonMappingException
     */
    public void testExceptionWithEmpty() throws Exception
    {
        try {
            Object result = MAPPER.readValue("    ", Object.class);
            fail("Expected an exception, but got result value: "+result);
        } catch (Exception e) {
            verifyException(e, MismatchedInputException.class, "No content");
        }
    }

    @SuppressWarnings("resource")
    public void testExceptionWithIncomplete()
        throws Exception
    {
        BrokenStringReader r = new BrokenStringReader("[ 1, ", "TEST");
        JsonParser p = MAPPER.getFactory().createParser(r);
        try {
            @SuppressWarnings("unused")
            Object ob = MAPPER.readValue(p, Object.class);
            fail("Should have gotten an exception");
        } catch (IOException e) {
            /* For "bona fide" IO problems (due to low-level problem,
             * thrown by reader/stream), IOException must be thrown
             */
            verifyException(e, IOException.class, "TEST");
        }
    }

    public void testExceptionWithEOF() throws Exception
    {
        JsonParser p = MAPPER.getFactory().createParser("  3");

        Integer I = MAPPER.readValue(p, Integer.class);
        assertEquals(3, I.intValue());

        // and then end-of-input...
        try {
            I = MAPPER.readValue(p, Integer.class);
            fail("Should have gotten an exception");
        } catch (IOException e) {
            verifyException(e, MismatchedInputException.class, "No content");
        }
        // also: should have no current token after end-of-input
        JsonToken t = p.getCurrentToken();
        if (t != null) {
            fail("Expected current token to be null after end-of-stream, was: "+t);
        }
        p.close();
    }

    // [databind#1414]
    public void testExceptionForNoCreators() throws Exception
    {
        try {
            NoCreatorsBean b = MAPPER.readValue("{}", NoCreatorsBean.class);
            fail("Should not succeed, got: "+b);
        } catch (JsonMappingException e) {
            verifyException(e, InvalidDefinitionException.class, "no Creators");
        }
    }

    /*
    /**********************************************************
    /* Helper methods
    /**********************************************************
     */

    void verifyException(Exception e, Class<?> expType, String expMsg)
        throws Exception
    {
        if (e.getClass() != expType) {
            fail("Expected exception of type "+expType.getName()+", got "+e.getClass().getName());
        }
        if (expMsg != null) {
            verifyException(e, expMsg);
        }
    }
}