src/main/software/amazon/event/ruler/JsonRuleCompiler.java [65:97]:
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    public static String check(final Reader source) {
        try {
            doCompile(JSON_FACTORY.createParser(source));
            return null;
        } catch (Exception e) {
            return e.getLocalizedMessage();
        }
    }

    public static String check(final String source) {
        try {
            doCompile(JSON_FACTORY.createParser(source));
            return null;
        } catch (Exception e) {
            return e.getLocalizedMessage();
        }
    }

    public static String check(final byte[] source) {
        try {
            doCompile(JSON_FACTORY.createParser(source));
            return null;
        } catch (Exception e) {
            return e.getLocalizedMessage();
        }
    }

    public static String check(final InputStream source) {
        try {
            doCompile(JSON_FACTORY.createParser(source));
            return null;
        } catch (Exception e) {
            return e.getLocalizedMessage();
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src/main/software/amazon/event/ruler/RuleCompiler.java [50:97]:
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    public static String check(final Reader source) {
        try {
            doCompile(JSON_FACTORY.createParser(source));
            return null;
        } catch (Exception e) {
            return e.getLocalizedMessage();
        }
    }

    /**
     * Verify the syntax of a rule
     * @param source rule, as a String
     * @return null if the rule is valid, otherwise an error message
     */
    public static String check(final String source) {
        try {
            doCompile(JSON_FACTORY.createParser(source));
            return null;
        } catch (Exception e) {
            return e.getLocalizedMessage();
        }
    }

    /**
     * Verify the syntax of a rule
     * @param source rule, as a byte array
     * @return null if the rule is valid, otherwise an error message
     */
    public static String check(final byte[] source) {
        try {
            doCompile(JSON_FACTORY.createParser(source));
            return null;
        } catch (Exception e) {
            return e.getLocalizedMessage();
        }
    }

    /**
     * Verify the syntax of a rule
     * @param source rule, as an InputStream
     * @return null if the rule is valid, otherwise an error message
     */
    public static String check(final InputStream source) {
        try {
            doCompile(JSON_FACTORY.createParser(source));
            return null;
        } catch (Exception e) {
            return e.getLocalizedMessage();
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