#vulnerable code 
                                public String adviser(final String pid) throws IOException {
        if (!this.exists(pid)) {
            throw new IllegalArgumentException(
                new Par(
                    "Project %s doesn't exist, can't get adviser"
                ).say(pid)
            );
        }
        try (final Item item = this.item()) {
            return new Xocument(item.path()).xpath(
                String.format(
                    "/catalog/project[@id = '%s']/adviser/text()",
                    pid
                )
            ).get(0);
        }
    } 
                            #location 6 
                            #vulnerability type RESOURCE_LEAK
#fixed code
                                public String adviser(final String pid) throws IOException {
        this.checkExist(pid);
        try (final Item item = this.item()) {
            return new Xocument(item.path()).xpath(
                String.format(
                    "/catalog/project[@id = '%s']/adviser/text()",
                    pid
                )
            ).get(0);
        }
    }