IDE quer que o método isTokenValido seja static

import java.io.IOException; import javax.servlet.FilterChain; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.filter.OncePerRequestFilter; public class AutenticacaoViaTokenFilter extends OncePerRequestFilter{ private TokenService tokenService; public AutenticacaoViaTokenFilter(TokenService tokenService) { this.tokenService = tokenService; } @Override protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException { String token = recuperarToken(request); boolean valido = TokenService.isTokenValido(token); System.out.println(valido); filterChain.doFilter(request, response); }

private String recuperarToken(HttpServletRequest request) {
    String token = request.getHeader("Authorization");
    if(token == null || token.isEmpty() || !token.startsWith("Bearer ")) {
        return null;
    }

    return token.substring(7, token.length());
}

}

public boolean isTokenValido(String token) {
    try {
        Jwts.parser().setSigningKey(this.secret).parseClaimsJws(token);
        return true;
    }catch(Exception e) {
        return false;
    }
}

import java.util.Date; import org.springframework.beans.factory.annotation.Value; import org.springframework.security.core.Authentication; import org.springframework.stereotype.Service; import br.com.forum.modelo.Usuario; import io.jsonwebtoken.Jwts; import io.jsonwebtoken.SignatureAlgorithm;

@Service public class TokenService {

@Value("${forum.jwt.expiration}")
private String expiration;

@Value("${forum.jwt.secret}")
private String secret;


public String geraToken(Authentication authentication) {

    Usuario logado = (Usuario)authentication.getPrincipal();
    Date hoje = new Date();
    Date dataExpiracao = new Date(hoje.getTime() + Long.parseLong(expiration));

    return Jwts.builder()
            .setIssuer("API do Forúm")
            .setSubject(logado.getId().toString())
            .setIssuedAt(hoje)
            .setExpiration(dataExpiracao)
            .signWith(SignatureAlgorithm.HS256, secret)
            .compact();
}

public boolean isTokenValido(String token) {
    try {
        Jwts.parser().setSigningKey(this.secret).parseClaimsJws(token);
        return true;
    }catch(Exception e) {
        return false;
    }
}

}

import java.io.IOException; import javax.servlet.FilterChain; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.filter.OncePerRequestFilter; public class AutenticacaoViaTokenFilter extends OncePerRequestFilter{

private TokenService tokenService;

public AutenticacaoViaTokenFilter(TokenService tokenService) {
    this.tokenService = tokenService;
}

@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
        throws ServletException, IOException {        
    String token = recuperarToken(request);                
    boolean valido = TokenService.isTokenValido(token);            
    System.out.println(valido);        
    filterChain.doFilter(request, response);

}
private String recuperarToken(HttpServletRequest request) {
    String token = request.getHeader("Authorization");
    if(token == null || token.isEmpty() || !token.startsWith("Bearer ")) {
        return null;
    }

    return token.substring(7, token.length());
}

}