src/main/java/org/apache/nifi/processor/util/StandardValidators.java [859:871]:
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        @Override
        public ValidationResult validate(final String subject, final String value, final ValidationContext context) {
            if (context.isExpressionLanguageSupported(subject) && context.isExpressionLanguagePresent(value)) {
                return new ValidationResult.Builder().subject(subject).input(value).explanation("Expression Language Present").valid(true).build();
            }

            final String substituted;
            if (allowEL) {
                try {
                    substituted = context.newPropertyValue(value).evaluateAttributeExpressions().getValue();
                } catch (final Exception e) {
                    return new ValidationResult.Builder().subject(subject).input(value).valid(false)
                            .explanation("Not a valid Expression Language value: " + e.getMessage()).build();
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src/main/java/org/apache/nifi/processor/util/StandardValidators.java [927:939]:
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        @Override
        public ValidationResult validate(final String subject, final String value, final ValidationContext context) {
            if (context.isExpressionLanguageSupported(subject) && context.isExpressionLanguagePresent(value)) {
                return new ValidationResult.Builder().subject(subject).input(value).explanation("Expression Language Present").valid(true).build();
            }

            final String substituted;
            if (allowEL) {
                try {
                    substituted = context.newPropertyValue(value).evaluateAttributeExpressions().getValue();
                } catch (final Exception e) {
                    return new ValidationResult.Builder().subject(subject).input(value).valid(false)
                            .explanation("Not a valid Expression Language value: " + e.getMessage()).build();
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