RE: newbie with Cayenne Quick Start > Tapestry Tutorial

From: Michael Mangus (mdmangu..mail.com)
Date: Thu Feb 10 2005 - 20:54:55 EST

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    Hi,

    I have another Question about Cayenne Quick Start > Tapestry Tutorial.

    I got it running and all the pages worked fine except:

    AddPaintingPage gives this error:

    org.apache.tapestry.BindingException
    Parameter value (0) is an instance of java.math.BigDecimal, which does not
    inherit from java.lang.String.
    binding: ExpressionBinding[AddPaintingPage painting.estimatedPrice]
    location: context:/WEB-INF/pages/AddPaintingPage.page, line 21, column
    64

    I believe is because the TextField implements String and can't bind directly
    to the BigDecimal Type of painting.estimatedPrice.

    I had to change the following:
    AddPaintingPage.java
              public void pageBeginRender(PageEvent event) {
            Painting painting = new Painting();
            painting.setEstimatedPrice(new BigDecimal(0));
            setPainting(painting);
                 }

    TO
            public void pageBeginRender(PageEvent event) {
            Painting painting = new Painting();
            painting.setEstimatedPrice("0");
            setPainting(painting);
            }

    I also had to change the generated class file from Cayenne:
        public void setEstimatedPrice(java.math.BigDecimal estimatedPrice) {
            writeProperty("estimatedPrice", estimatedPrice);
        }
        public java.math.BigDecimal getEstimatedPrice() {
            return (java.math.BigDecimal)readProperty("estimatedPrice");
        

    TO
        public void setEstimatedPrice(String estimatedPrice) {
            writeProperty("estimatedPrice", estimatedPrice);
        }
        public String getEstimatedPrice() {
            return readProperty("estimatedPrice").toString();
        }

    After I changed those above I could run the whole example with no problems.

    My question is that the generated class says:
    /** Class _Painting was generated by Cayenne.
      * It is probably a good idea to avoid changing this class manually,
      * since it may be overwritten next time code is regenerated.
      * If you need to make any customizations, please use subclass.
      */

    I thought about overriding the method in the Painting class that extends
    _Painting, but it doesn't allow that with return types not matching.

    Where would I make this change without worrying about my changes being
    overwritten by Cayenne?

    Thank you for your help.

    Michael

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