How to Fix Java Error Invalid Character Found in Method Name. HTTP Method Names Must Be Tokens

1. Causes of Tomcat: java.lang.IllegalArgumentException: Invalid character found in method name. HTTP method names must be tokens Error
2. Solution of Tomcat: java.lang.IllegalArgumentException: Invalid character found in method name. HTTP method names must be tokens Error

The tutorial will discuss some possible causes and solutions for the Tomcat: java.lang.IllegalArgumentException: Invalid character found in method name. HTTP method names must be tokens.

Causes of Tomcat: java.lang.IllegalArgumentException: Invalid character found in method name. HTTP method names must be tokens Error

The following are some of the potential scenarios for why the error occurs.

1. Users can run across this exception when attempting to execute an HTTPS request from a client on an endpoint that does not have HTTPS enabled. The client encrypts the requested data when the server is just focused on raw data.

2. To put it another way, these exceptions typically occur whenever there is a disparity between what the server anticipates and what it receives. One of the many conceivable outcomes is what you just described.

   Your server may have an endpoint that does not adhere to the HTTPS standards.

3. In some instances, the value of the Content-Length header did not correspond to the length of the body.

4. This error often occurs when you attempt to use a URI scheme on the server on which the application is deployed that does not support it.

Solution of Tomcat: java.lang.IllegalArgumentException: Invalid character found in method name. HTTP method names must be tokens Error

Listed below are options for resolving the issue that can be applied.

1. Replace https with http in the URL of your client. Most likely, doing so will be effective. For example, if you access the local server with http://localhost:8080/foo/bar, Use the URL https://localhost:8080/foo/bar to access it.

2. Clear browsing data by pressing Ctrl + Shift + Delete controls and then click on Clear data as shown in the snippet.

   

3. Clear SSL State Since the SSL state cannot be removed from inside the browser settings of Google Chrome on a PC, this must be done via the operating system’s settings instead. Therefore, follow these instructions to clear the SSL state.

   • In the start menu, search Internet Options and open it.

   

   • Click on the Content tab in the resulting dialogue box.

   

   • Click on the Clear SSL State button.

   

   • Click on OK, and the SSL state will be cleared.

   

4. Configure the https protocol for the application, which requires a certificate. Let's Encrypt is a resource that can provide you with certificates. The process of producing and acquiring a self-signed certificate is the simplest option.

   • Create a Keystore file for the application first. This file will function more like a self-signed certificate for the https protocol.

   sudo keytool - genkey - keyalg RSA - alias tomcat - Keystore / usr / share / tomcat.keystore
   

   • Next, in the Tomcat server configuration file (/opt/tomcat/conf/server.xml), add an https Tomcat server connector for the application:

   sudo nano / opt / tomcat / conf / server.xml
   

   • Finish setting up the app by including the following. Note that both the path and password for the Keystore file are supplied. Also, an https port separate from the http port is specified.

   <Connector protocol="org.apache.coyote.http11.Http11Protocol"
    port="8443" maxThreads="200" scheme="https"
    secure="true" SSLEnabled="true"
    keystoreFile="/usr/share/tomcat.keystore"
    keystorePass="my-password"
    clientAuth="false" sslProtocol="TLS"
    URIEncoding="UTF-8"
    compression="force"
    compressableMimeType="text/html,text/xml,text/plain,text/javascript,text/css"/>