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  1. JDK
  2. JDK-8016545

java.beans.XMLEncoder.writeObject output is wrong

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        FULL PRODUCT VERSION :
        java version " 1.7.0_15 "
        Java(TM) SE Runtime Environment (build 1.7.0_15-b03)
        Java HotSpot(TM) Client VM (build 23.7-b01, mixed mode, sharing)

        ADDITIONAL OS VERSION INFORMATION :
        Microsoft Windows XP [Version 5.1.2600]

        A DESCRIPTION OF THE PROBLEM :
        If Bean properties are initialized with static values, XMLEncoder.writeObject sometimes writes out nonsense. So XMLDecoder.readObject can't read the Java bean correctly. See example!


        STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
        Type in the given example (Class Test) and run it. It writes out a wrong serialization of Test$MyClass.


        EXPECTED VERSUS ACTUAL BEHAVIOR :
        EXPECTED -
        The expected result from the Test example is:

        <?xml version= " 1.0 " encoding= " UTF-8 " ?>
        <java version= " 1.7.0_15 " class= " java.beans.XMLDecoder " >
         <object class= " Test$MyClass " >
          <void id= " Boolean0 " property= " gut " />
          <void property= " info " >
           <object class= " Test$Info " >
            <void property= " enabled " >
             <object idref= " Boolean0 " />
            </void>
            <void property= " IEin " >
             <int>1</int>
            </void>
           </void>
          </void>
          <void property= " sticky " >
           <boolean>false</boolean>
          </void>
         </object>
        </java>

        OK

        You can produce this output by changing in the example the line
        private Info info = new Info();
        to
        private Info info;



        ACTUAL -
        The example produces the following wrong output:

        <?xml version= " 1.0 " encoding= " UTF-8 " ?>
        <java version= " 1.7.0_15 " class= " java.beans.XMLDecoder " >
         <object class= " Test$MyClass " >
          <void property= " info " >
           <void property= " IEin " >
            <int>1</int>
           </void>
           <void property= " enabled " >
            <void class= " Test$MyClass " id= " Test$MyClass0 " >
             <void id= " Boolean0 " property= " gut " />
             <void property= " sticky " >
              <boolean>false</boolean>
             </void>
            </void>
            <object idref= " Boolean0 " />
           </void>
          </void>
         </object>
        </java>

        Expected sticky=false, but is=null

        REPRODUCIBILITY :
        This bug can be reproduced always.

        ---------- BEGIN SOURCE ----------
        import java.io.ByteArrayInputStream;
        import java.io.ByteArrayOutputStream;

        import java.beans.XMLDecoder;
        import java.beans.XMLEncoder;

        public class Test {
            
            public static void main(String[] args) throws Exception {

                MyClass m = new MyClass();
                m.setSticky(Boolean.FALSE);
                Info omi = new Info();
                omi.setEnabled(Boolean.TRUE);
                omi.setIEin(new Integer(1));
                m.setInfo(omi);

                ByteArrayOutputStream arraystream = new ByteArrayOutputStream();
                XMLEncoder encoder = new XMLEncoder(arraystream);
                encoder.writeObject(m);
                encoder.close();
                arraystream.close();
                System.out.println(arraystream.toString());

                XMLDecoder decoder = new XMLDecoder(new ByteArrayInputStream(arraystream.toByteArray()));
                m = (MyClass) decoder.readObject();
                decoder.close();
                if (!Boolean.FALSE.equals(m.getSticky())) {
                    System.out.println( " Expected sticky=false, but is= " + m.getSticky());
                } else {
                    System.out.println( " OK " );
                }
            }

            public static class MyClass {
                
                private Info info = new Info();
                public Info getInfo() {
                    return this.info;
                }
                public void setInfo(Info anInfo) {
                    this.info = anInfo;
                }
                
                private Boolean gut = Boolean.TRUE;
                public java.lang.Boolean getGut() {
                    return this.gut;
                }
                public void setGut(Boolean gut) {
                    this.gut = gut;
                }

                private Boolean sticky;
                public Boolean getSticky() {
                    return this.sticky;
                }
                public void setSticky(Boolean sticky) {
                    this.sticky = sticky;
                }
            }
            
            public static class Info {

                private Integer iEin;
                public Integer getIEin() {
                    return this.iEin;
                }
                public void setIEin(Integer iEin) {
                    this.iEin = iEin;
                }

                private Boolean enabled;
                public Boolean getEnabled() {
                    return this.enabled;
                }
                public void setEnabled(Boolean enabled) {
                    this.enabled = enabled;
                }
            }
        }
        ---------- END SOURCE ----------

        CUSTOMER SUBMITTED WORKAROUND :
        Avoid setting bean properties to static values, especially when the bean is instantiated (constructor or variable declaration).

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                • Assignee:
                  malenkov Sergey Malenkov (Inactive)
                  Reporter:
                  webbuggrp Webbug Group
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                  • Created:
                    Updated:
                    Resolved: