问题
In my Vaadin 12 and Kotlin project:
Here myhtml.html
<!DOCTYPE html>
<html>
<head>
<script src="https://myjavascript.js"></script>
<script>
var checkObject = Util(
'pk_aaaa',
{
betas: ['bbbb_4']
}
);
window.checkObject = checkObject;
function goToCheckout(){
checkObject.redirectToCheckout({
sessionId: "abcddddddddd",
})
}
</script>
</head>
</html>
And this page success call method redirectToCheckout in browser. But I need to do this from Vaadin 12.
I need to call method checkObject.redirectToCheckout from my Vaadin code:
import com.vaadin.flow.component.UI
import com.vaadin.flow.component.dependency.HtmlImport
import com.vaadin.flow.component.dependency.JavaScript
import com.vaadin.flow.component.html.Div
import com.vaadin.flow.router.Route
import com.vaadin.flow.server.VaadinRequest
import org.slf4j.LoggerFactory
@Route(value = "redir")
@JavaScript("https://myjavascript.js")
@HtmlImport("styles/myhtml.html")
class RedirectForm : Div() {
private val logger = LoggerFactory.getLogger(this::class.java)
init {
val request = VaadinRequest.getCurrent()
val param = request.getParameter("myParam")
val map = HashMap<String, String>()
map["sessionId"] = param
UI.getCurrent().getPage().executeJavaScript("checkObject.redirectToCheckout($0)", map)
}
}
But I get error:
Caused by: java.lang.IllegalArgumentException: Can't encode class java.util.HashMap to json
2019-04-02 18:09:26,835 12247 [qtp1750286943-20] ERROR c.v.flow.router.InternalServerError - There was an exception while trying to navigate to 'redir'
java.lang.IllegalArgumentException: Unable to create an instance of 'myproject.view.RedirectForm'. The constructor threw an exception.
at com.vaadin.flow.internal.ReflectTools.createProxyInstance(ReflectTools.java:510)
at com.vaadin.flow.internal.ReflectTools.createInstance(ReflectTools.java:447)
at com.vaadin.flow.di.DefaultInstantiator.getOrCreate(DefaultInstantiator.java:65)
at com.vaadin.flow.di.Instantiator.createRouteTarget(Instantiator.java:158)
at com.vaadin.flow.router.internal.AbstractNavigationStateRenderer.lambda$getRouteTarget$1(AbstractNavigationStateRenderer.java:121)
at java.util.Optional.orElseGet(Optional.java:267)
at com.vaadin.flow.router.internal.AbstractNavigationStateRenderer.getRouteTarget(AbstractNavigationStateRenderer.java:120)
at com.vaadin.flow.router.internal.AbstractNavigationStateRenderer.handle(AbstractNavigationStateRenderer.java:178)
at com.vaadin.flow.router.Router.handleNavigation(Router.java:219)
at com.vaadin.flow.router.Router.navigate(Router.java:190)
at com.vaadin.flow.router.Router.initializeUI(Router.java:92)
at com.vaadin.flow.server.BootstrapHandler.createAndInitUI(BootstrapHandler.java:1117)
at com.vaadin.flow.server.BootstrapHandler.synchronizedHandleRequest(BootstrapHandler.java:396)
at com.vaadin.flow.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:40)
at com.vaadin.flow.server.VaadinService.handleRequest(VaadinService.java:1507)
at com.vaadin.flow.server.VaadinServlet.service(VaadinServlet.java:242)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:867)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1623)
at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:214)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1588)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1345)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1557)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1247)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:61)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.Server.handle(Server.java:502)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException: null
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.vaadin.flow.internal.ReflectTools.createProxyInstance(ReflectTools.java:479)
... 45 common frames omitted
Caused by: java.lang.IllegalArgumentException: Can't encode class java.util.HashMap to json
at com.vaadin.flow.internal.JsonCodec.encodeWithoutTypeInfo(JsonCodec.java:165)
at com.vaadin.flow.internal.JsonCodec.encodeWithTypeInfo(JsonCodec.java:80)
at com.vaadin.flow.component.page.Page.executeJavaScript(Page.java:338)
at myproject.view.RedirectForm.<init>(RedirectView.kt:29)
... 50 common frames omitted
回答1:
Use JsonObject instead HashMap:
val request = VaadinRequest.getCurrent()
val param = request.getParameter("myParam")
val json = Json.createObject()
json.put("sessionId", param)
UI.getCurrent().getPage().executeJavaScript("checkObject.redirectToCheckout($0)", json)
来源：https://stackoverflow.com/questions/55478212/vaadin-12-javascript-java-lang-illegalargumentexception-cant-encode-class-ja