output: #fixed code
                                  public Collection<String> links(final String pid) throws IOException {
          this.checkExist(pid);
          try (final Item item = this.item()) {
              return new SolidList<>(
                  new Mapped<>(
                      xml -> String.format(
                          "%s:%s",
                          xml.xpath("@rel").get(0),
                          xml.xpath("@href").get(0)
                      ),
                      new Xocument(item).nodes(
                          String.format(
                              "/catalog/project[@id='%s']/links/link",
                              pid
                          )
                      )
                  )
              );
          }
      }
input: #vulnerable code 
                                  public Collection<String> links(final String pid) throws IOException {
          if (!this.exists(pid)) {
              throw new IllegalArgumentException(
                  new Par(
                      "Project %s doesn't exist, can't get links"
                  ).say(pid)
              );
          }
          try (final Item item = this.item()) {
              return new SolidList<>(
                  new Mapped<>(
                      xml -> String.format(
                          "%s:%s",
                          xml.xpath("@rel").get(0),
                          xml.xpath("@href").get(0)
                      ),
                      new Xocument(item).nodes(
                          String.format(
                              "/catalog/project[@id='%s']/links/link",
                              pid
                          )
                      )
                  )
              );
          }
      } 
                              #location 6 
                              #vulnerability type RESOURCE_LEAK