[英]Can not cast Principal to KeycloakPrincipal in a WebFilter but no problem with servlet
Environment:环境:
I am trying to cast Principal to get Keycloak user information, but I receive a ClassCastException.我正在尝试强制转换 Principal 以获取 Keycloak 用户信息,但我收到了 ClassCastException。 WebFilter and WebServlet are in different maven modules.
WebFilter 和 WebServlet 位于不同的 maven 模块中。
org.keycloak.KeycloakPrincipal is in unnamed module of loader 'org.keycloak.keycloak-core@11.0.2' @4d7642f0; org.keycloak.KeycloakPrincipal 位于加载程序 'org.keycloak.keycloak-core@11.0.2' @4d7642f0 的未命名模块中; org.keycloak.KeycloakPrincipal is in unnamed module of loader 'deployment.app.ear' @4d7682a1
org.keycloak.KeycloakPrincipal 位于加载程序“deployment.app.ear”@4d7682a1 的未命名模块中
Error log错误日志
cast: java.lang.ClassCastException:
class org.keycloak.KeycloakPrincipal cannot be cast to class org.keycloak.KeycloakPrincipal
(org.keycloak.KeycloakPrincipal is in unnamed module of loader 'org.keycloak.keycloak-core@11.0.2' @4d7642f0; org.keycloak.KeycloakPrincipal is in unnamed module of loader 'deployment.app.ear' @4d7682a1
...
pom.xml (root) pom.xml(根)
...
<modules>
<module>app-back</module> <!--where webservlet is-->
<module>app-ejb</module> <!--where webfilter is-->
<module>app-ear</module>
</modules>
...
WebFilter CAST KO WebFilter CAST KO
@WebFilter(filterName = "Filter", urlPatterns = "/*")
public class FilterPrincipal implements Filter {
...
@Override
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws java.io.IOException, ServletException {
...
HttpServletRequest sReq = ((HttpServletRequest) req);
KeycloakPrincipal<KeycloakSecurityContext> kp = (KeycloakPrincipal<KeycloakSecurityContext>) principal;//error
KeycloakSecurityContext keycloakSecurityContext = kp.getKeycloakSecurityContext();
AccessToken token = keycloakSecurityContext.getToken();
writer.println("username = " + token.getPreferredUsername());
...
chain.doFilter(req, resp);
}
...
**WebServlet CAST OK**
@WebServlet(urlPatterns = "/principal")
public class PrincipalInfoServlet extends HttpServlet {
...
@SuppressWarnings("unchecked")
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
...
Principal principal = request.getUserPrincipal();
if (principal != null) {
...
// API keycloak
if (principal instanceof KeycloakPrincipal<?>) {
writer.println("--------------------------------");
writer.println("Informació del token de keycloak:");
KeycloakPrincipal<KeycloakSecurityContext> kp = (KeycloakPrincipal<KeycloakSecurityContext>) principal;//OK
KeycloakSecurityContext keycloakSecurityContext = kp.getKeycloakSecurityContext();
...
I found a workaround by moving webservlet to maven modul app-back so the KeycloakPrincipals are in the same module.我通过将 webservlet 移动到 maven modul app-back 找到了一种解决方法,因此 KeycloakPrincipals 在同一个模块中。
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