java.lang.IllegalArgumentException: !hex:25

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java.lang.IllegalArgumentException: !hex:25
at org.eclipse.jetty.util.TypeUtil.convertHexDigit(TypeUtil.java:364)
at org.eclipse.jetty.util.UrlEncoded.decodeUtf8To(UrlEncoded.java:329)
at org.eclipse.jetty.http.HttpURI.decodeQueryTo(HttpURI.java:638)
at org.eclipse.jetty.server.Request.extractParameters(Request.java:213)
at com.example.EchoServlet.handle(EchoServlet.java:29)
at com.example.EchoServlet.doGet(EchoServlet.java:24)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:565)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:479)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)

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