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org.springframework.expression.spel.SpelEvaluationException: EL1030E 运行Spring项目时报错如下： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 org.springframework.expression.spel.SpelEvaluationException: EL1030E: The operator 'ADD' is not supported between objects of type 'java.lang.String' and 'null' at org.springframework.expression.spel.ExpressionState.operate(ExpressionState.java:240) at org.springframework.expression.spel.ast.OpPlus.getValueInternal(OpPlus.java:80) at org.springframework.e...