Maven entry for SpEL as a ScriptEngine - spring

Question

Can you please point me to maven dependency to add the SpEL - Spring Expression Language - as a ScriptEngine to my project - is there any in Spring?)
I've found some examples:
https://gist.github.com/maggandalf/1380124
https://github.com/melin/starflow/blob/master/src/main/java/com/googlecode/starflow/core/script/spel/SpelScriptEngine.java
The code in examples show how to wrap SpEL as a JSR-223 scripting engine and make it available to scripting manager by name (say, "spel").
But I'd like it in a form of maven dependency.

Answer 1

I don't know if I understand you correctly, but try this
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>4.3.3.RELEASE</version>
</dependency>
If pom.xml has this dependency only, the code in the package
https://github.com/melin/starflow/blob/master/src/main/java/com/googlecode/starflow/core/script/spel/
should compile with JDK1.8.
(replace 4.3.3.RELEASE with another version if there is a need).

Answer 2

I've just tried https://github.com/eobermuhlner/spel-scriptengine
You just need too add this to your pom.xml
<dependency>
<groupId>ch.obermuhlner</groupId>
<artifactId>spel-scriptengine</artifactId>
<version>1.0.0</version>
</dependency>
And then use it with Hibernate Validator like this:
package org.eu.rubensa.model;
import java.time.Instant;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
import org.hibernate.validator.constraints.ScriptAssert;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.NoArgsConstructor;
#Entity
#Table(name = "sample")
#Data
#EqualsAndHashCode(callSuper = false)
#NoArgsConstructor
#AllArgsConstructor
#ScriptAssert.List({
// Month valiadation
#ScriptAssert(lang = "spel", alias = "_this", script = "#_this.getLower() == null || #_this.getHigher() == null || #_this.getHigher().compareTo(#_this.getLower()) >= 0", reportOn = "finalMonth", message = "{org.eu.rubensa.validation.LowerGreaterThanHigher.message}"),
// Instant validation
#ScriptAssert(lang = "spel", alias = "_this", script = "#_this.getStart() == null || #_this.getEnd() == null || #_this.getEnd().compareTo(#_this.getStart()) >= 0", reportOn = "fechaFinPresentacion", message = "{org.eu.rubensa.validation.StartGreaterThanEnd.message}") })
public class SampleEntity {
#Id
#Column(name = "id", nullable = false)
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "sample_seq")
#SequenceGenerator(name = "sample_seq", sequenceName = "sample_seq", allocationSize = 1)
private Long id;
#Column(name = "lower", nullable = false)
#NotNull
#Min(1)
private Integer lower;
#Column(name = "higher", nullable = false)
#NotNull
#Min(1)
private Integer higher;
#Column(name = "start", nullable = true)
private Instant start;
#Column(name = "end", nullable = true)
private Instant end;
}