从JavaScript调用applet的方法

Question

I need to print some information via an applet. My applet from signed qds-client.jar:

public class PrintText extends Applet  implements Printable {

 private ClientAccount clientAccount;

 public ClientAccount getClientAccount() {
     return clientAccount;
 }

 public void setClientAccount (ClientAccount clientAccount) {
     this.clientAccount = clientAccount;
 }

 public void setClientAccountFromJSON(String json) {
     this.clientAccount = toClientAccountFromJSON(json);
     System.out.println("------------------------------SetClient");
 }

 public int print(Graphics g, PageFormat format, int page) throws
         ...
 }

 public void printText() throws PrinterException {
     ...
 }

 private String getTextToPrint(ClientAccount clientAccount) throws PrinterException {
     ...
 }

 private ClientAccount toClientAccountFromJSON(String json) {
     return JsonUtils.fromJson(ClientAccount.class, json);
 }

 public void startPrint () {
     System.out.println("------------------------------------------Start");
 }
}

Accordinng JNLP:

<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="1.5+" codebase="http://localhost:10099/partials/" href="print.jnlp">
    <information>
       ....
    </information>

<resources>
    <jar href="/partials/qds-client.jar"/>
    <jar href="/partials/core-3.2.1.jar"/>
    <jar href="/partials/gson-2.3.1.jar"/>
</resources>

<applet-desc name="printText" main-class="com.qdsrest.utils.printer.PrintText" width="500" height="200"></applet-desc>

<update check="background"/>
<security>
    <all-permissions/>
</security>

and HTML tag:

<applet name="printApplet" jnlp_href="/partials/print.jnlp" width="10" height="10">
<param name="permissions" value="all-permissions"/>
</applet>

When I call applet's method from js file like this:

document.printApplet.setClientAccountFromJSON({/not empty/});

I get

Error: Error calling method on NPObject!

in Mozilla and

basic: JNLP2ClassLoader.findClass: com.google.gson.internal.bind.CollectionTypeAdapterFactory: try again ..
basic: JNLP2ClassLoader.findClass: com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter: try again ..
basic: JNLP2ClassLoader.findClass: com.google.gson.internal.bind.MapTypeAdapterFactory: try again ..
basic: JNLP2ClassLoader.findClass: com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter: try again ..
basic: JNLP2ClassLoader.findClass: com.google.gson.internal.bind.JsonAdapterAnnotationTypeAdapterFactory: try again ..

in Java Console and method doesn't work. Why I get "try again .."? What does it mean? Method toClientAccountFromJSON uses GSON lib gson-2.3.1.jar wich perfectly deserialize JSON object into Java object. What wrong things did I do? Tell me, please, a right thinking way.

Answer 1

I don't recall the current details, but long ago at the age of the first browser wars, there once was an attribute mayscript your applet needed in order to talk to javascript.

Oh and parameter needs to be string:

 setClientAccountFromJSON("somestring or stringvar");