That old Spring magic has me in its SpEL
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That old Spring magic has me in its SpEL

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Presentation on the Spring Expression Language that I gave at SpringOne/2GX 2009 in New Orleans, LA.

Presentation on the Spring Expression Language that I gave at SpringOne/2GX 2009 in New Orleans, LA.

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    That old Spring magic has me in its SpEL That old Spring magic has me in its SpEL Presentation Transcript

    • That old Spring magic has me in its SpEL Craig Walls
    • About me SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • About me • Java, Spring, and OSGi fanatic SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • About me • Java, Spring, and OSGi fanatic • Principal consultant with Improving Enterprises SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • About me • Java, Spring, and OSGi fanatic • Principal consultant with Improving Enterprises • Author SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • About me • Java, Spring, and OSGi fanatic • Principal consultant with Improving Enterprises • Author SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Agenda 3 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Agenda • Introducing SpEL 3 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Agenda • Introducing SpEL • Using SpEL 3 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Agenda • Introducing SpEL • Using SpEL • SpEL Essentials 3 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Agenda • Introducing SpEL • Using SpEL • SpEL Essentials • A few SpEL incantations 3 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Agenda • Introducing SpEL • Using SpEL • SpEL Essentials • A few SpEL incantations • Q&A 3 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Download the examples Approximately the same code... http://spring.habuma.com/examples/SpEL-examples.zip 4 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Introducing SpEL SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • What is SpEL 6 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • What is SpEL • New in Spring 3.0 6 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • What is SpEL • New in Spring 3.0 – Originally conceived in Spring.NET 6 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • What is SpEL • New in Spring 3.0 – Originally conceived in Spring.NET • The Spring Expression Language 6 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • What is SpEL • New in Spring 3.0 – Originally conceived in Spring.NET • The Spring Expression Language • Much like Unified EL, OGNL, JBoss EL, and others 6 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • What is SpEL • New in Spring 3.0 – Originally conceived in Spring.NET • The Spring Expression Language • Much like Unified EL, OGNL, JBoss EL, and others • Will be used across entire Spring portfolio 6 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • What is SpEL • New in Spring 3.0 – Originally conceived in Spring.NET • The Spring Expression Language • Much like Unified EL, OGNL, JBoss EL, and others • Will be used across entire Spring portfolio • Succinctly express complex concepts 6 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • What is SpEL • New in Spring 3.0 – Originally conceived in Spring.NET • The Spring Expression Language • Much like Unified EL, OGNL, JBoss EL, and others • Will be used across entire Spring portfolio • Succinctly express complex concepts • Can be used to wire bean properties 6 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • What is SpEL • New in Spring 3.0 – Originally conceived in Spring.NET • The Spring Expression Language • Much like Unified EL, OGNL, JBoss EL, and others • Will be used across entire Spring portfolio • Succinctly express complex concepts • Can be used to wire bean properties • Can be used outside of Spring 6 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Using SpEL SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Configuring beans with SpEL (XML) SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Configuring beans with SpEL (XML) <bean id="appConfigurer" class="com.habuma.spel.tests.Witch"> <property name="name" value="#{systemProperties['WITCH_NAME']}" /> </bean> SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Configuring beans with SpEL (@Value) SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Configuring beans with SpEL (@Value) @Component public class Wizard { @Value("#{systemEnvironment['WIZARD_NAME']}") private String name; // ... } SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Programming with SpEL SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Programming with SpEL ExpressionParser parser = new SpelAntlrExpressionParser(); StandardEvaluationContext context = new StandardEvaluationContext(rootObject); Expression ex = parser.parseExpression("witches.^[isWicked()]"); Witch wickedWitch = (Witch) ex.getValue(context); SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Essential SpEL SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Literal expressions SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Literal expressions #{'abracadabra'} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Literal expressions #{'abracadabra'} #{42} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Literal expressions #{'abracadabra'} #{42} #{3.1415926} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Literal expressions #{'abracadabra'} #{42} #{3.1415926} #{1e4} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Literal expressions #{'abracadabra'} #{42} #{3.1415926} #{1e4} #{true} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Literal expressions #{'abracadabra'} #{42} #{3.1415926} #{1e4} #{true} #{false} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Literal expressions #{'abracadabra'} #{42} #{3.1415926} #{1e4} #{true} #{false} #{null} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Ready-to-use variables SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Ready-to-use variables #{systemProperties['WIZARD_NAME']} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Ready-to-use variables #{systemProperties['WIZARD_NAME']} #{systemProperties.WIZARD_NAME} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Ready-to-use variables #{systemProperties['WIZARD_NAME']} #{systemProperties.WIZARD_NAME} #{systemEnvironment['WIZARD_NAME']} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Ready-to-use variables #{systemProperties['WIZARD_NAME']} #{systemProperties.WIZARD_NAME} #{systemEnvironment['WIZARD_NAME']} #{systemEnvironment.WIZARD_NAME} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Ready-to-use variables #{systemProperties['WIZARD_NAME']} #{systemProperties.WIZARD_NAME} #{systemEnvironment['WIZARD_NAME']} #{systemEnvironment.WIZARD_NAME} #{wizardBean.name} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Ready-to-use variables #{systemProperties['WIZARD_NAME']} #{systemProperties.WIZARD_NAME} #{systemEnvironment['WIZARD_NAME']} #{systemEnvironment.WIZARD_NAME} #{wizardBean.name} Only available when using SpEL in Spring configuration SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Ready-to-use variables SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Ready-to-use variables #{request.getParameter('wizardId')} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Ready-to-use variables #{request.getParameter('wizardId')} #{session.getAttribute('wizard')} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Ready-to-use variables #{request.getParameter('wizardId')} #{session.getAttribute('wizard')} Can only be used to configure appropriately-scoped beans SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Constructors SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Constructors #{new com.habuma.spel.tests.Wizard('Gandalf')} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Constructors #{new com.habuma.spel.tests.Wizard('Gandalf')} #{new String('hokus pokus')} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Accessing object members SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Accessing object members #{elf.name} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Accessing object members #{elf.name} #{elf.Name} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Accessing object members #{elf.name} #{elf.Name} #{elf.getName()} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Accessing object members #{elf.name} #{elf.Name} #{elf.getName()} #{elf.name?.length()} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Mixing expressions and text SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Mixing expressions and text Embeds the wizard’s name in some text The wizard’s name is #{wizard.name} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Arithmetic operators SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Arithmetic operators #{'Harry' + ' ' + 'Potter'} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Arithmetic operators #{'Harry' + ' ' + 'Potter'} #{25 + 52} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Arithmetic operators #{'Harry' + ' ' + 'Potter'} #{25 + 52} #{2.19 + 2.02} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Arithmetic operators #{'Harry' + ' ' + 'Potter'} #{25 + 52} #{2.19 + 2.02} #{77 - 25} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Arithmetic operators #{'Harry' + ' ' + 'Potter'} #{25 + 52} #{2.19 + 2.02} #{77 - 25} #{52 - -25} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Arithmetic operators #{'Harry' + ' ' + 'Potter'} #{25 + 52} #{2.19 + 2.02} #{77 - 25} #{52 - -25} #{6 * 7} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Arithmetic operators #{'Harry' + ' ' + 'Potter'} #{25 + 52} #{2.19 + 2.02} #{77 - 25} #{52 - -25} #{6 * 7} #{42 / 6} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Arithmetic operators #{'Harry' + ' ' + 'Potter'} #{25 + 52} #{2.19 + 2.02} #{77 - 25} #{52 - -25} #{6 * 7} #{42 / 6} #{44 % 7} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Relational operators SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Relational operators #{42 > 7} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Relational operators #{42 > 7} #{7 > 42} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Relational operators #{42 > 7} #{7 > 42} #{10000 == 1e4} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Relational operators #{42 > 7} #{7 > 42} #{10000 == 1e4} #{‘Apple’ == ‘Apple’} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Relational operators #{42 > 7} #{7 > 42} #{10000 == 1e4} #{‘Apple’ == ‘Apple’} #{‘Apple’ < ‘Orange’} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Relational operators #{42 > 7} #{7 > 42} #{10000 == 1e4} #{‘Apple’ == ‘Apple’} #{‘Apple’ < ‘Orange’} #{‘Orange’ > ‘Apple’} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Logical operators SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Logical operators #{witch.isWicked() and witch.name == 'Elphaba'} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Logical operators #{witch.isWicked() and witch.name == 'Elphaba'} #{witch.isWicked() or witch.name == 'Tattypoo'} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Logical operators #{witch.isWicked() and witch.name == 'Elphaba'} #{witch.isWicked() or witch.name == 'Tattypoo'} #{!witch.isWicked()} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Ternary and Elvis operator SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Ternary and Elvis operator #{wizard.isGood() ? 'Gandalf' : 'Saruman'} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Ternary and Elvis operator #{wizard.isGood() ? 'Gandalf' : 'Saruman'} #{wizard.name ?: 'unknown'} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • The type operator : T() SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • The type operator : T() #{T(String)} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • The type operator : T() #{T(String)} #{T(Math)} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • The type operator : T() #{T(String)} #{T(Math)} #{T(int)} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • The type operator : T() #{T(String)} #{T(Math)} #{T(int)} #{T(java.util.Date)} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Accessing class members SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Accessing class members #{T(Math).floor(42.56)} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Accessing class members #{T(Math).floor(42.56)} #{T(Math).PI} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • instanceof SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • instanceof #{‘Sabrina’ instanceof T(String)} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • instanceof #{‘Sabrina’ instanceof T(String)} #{123 instanceof T(Integer)} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • instanceof #{‘Sabrina’ instanceof T(String)} #{123 instanceof T(Integer)} #{123L instanceof T(Long)} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • instanceof #{‘Sabrina’ instanceof T(String)} #{123 instanceof T(Integer)} #{123L instanceof T(Long)} #{1.23 instanceof T(Double)} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • instanceof #{‘Sabrina’ instanceof T(String)} #{123 instanceof T(Integer)} #{123L instanceof T(Long)} #{1.23 instanceof T(Double)} #{true instanceof T(Boolean)} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Regular expressions SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Regular expressions #{phoneNumber matches 'd{3}-d{3}-d{4}'} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Regular expressions #{phoneNumber matches 'd{3}-d{3}-d{4}'} #{websiteUrl matches 'http://www.[a-zA-Z0-9]*.(com|edu|net)'} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Regular expressions #{phoneNumber matches 'd{3}-d{3}-d{4}'} #{websiteUrl matches 'http://www.[a-zA-Z0-9]*.(com|edu|net)'} #{customerEmail matches '[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+.[a-zA-Z]{2,4}'} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Setting variables SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Setting variables Assuming that the root object has a name property... SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Setting variables Assuming that the root object has a name property... name = 'Broomhilda' SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Accessing collection members SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Accessing collection members Arrays #{wizards[0]} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Accessing collection members Arrays #{wizards[0]} Maps and Properties #{magicWords['abracadabra']} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Collection selection SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Collection selection Select all witches that aren’t wicked #{witches.?[!isWicked()]} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Collection selection Select all witches that aren’t wicked #{witches.?[!isWicked()]} Select the first wicked witch #{witches.^[isWicked()]} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Collection selection Select all witches that aren’t wicked #{witches.?[!isWicked()]} Select the first wicked witch #{witches.^[isWicked()]} Select the last wicked witch #{witches.$[isWicked()]} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Collection projection SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Collection projection Get the names of all wizards #{wizards.![name]} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • The #this variable SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • The #this variable Get the names of all wizards whose name is lexically ordered after ‘G’ #{wizards.![name].?[#this > 'G']} SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Adding a custom function Only available with programmatic SpEL 31 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Adding a custom function Only available with programmatic SpEL context = new StandardEvaluationContext(); parser = new SpelAntlrExpressionParser(); context.registerFunction("inEnglish", EnglishNumberInator.class.getDeclaredMethod( "translate", new Class[] {int.class})); 31 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Adding a custom function Only available with programmatic SpEL context = new StandardEvaluationContext(); parser = new SpelAntlrExpressionParser(); context.registerFunction("inEnglish", EnglishNumberInator.class.getDeclaredMethod( "translate", new Class[] {int.class})); Expression ex = parser.parseExpression("#inEnglish(123)"); String englishNumber = ex.getValue(context); 31 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Demo SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • A few SpEL incantations SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Wiring in a system property (with a default) SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Wiring in a system property (with a default) <bean class="Wizard"> <property name="name" value= "#{systemProperties['WIZARD_NAME'] ?: 'Gandalf'}" /> </bean> SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Wiring bean references SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Wiring bean references @Value("#{pricingService}") private PricingService pricingService; SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Wiring bean references @Value("#{pricingService}") private PricingService pricingService; ...or... <property name="pricingService" value="#{pricingService}" /> SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Wiring bean references @Value("#{pricingService}") private PricingService pricingService; ...or... <property name="pricingService" value="#{pricingService}" /> Don’t do this! SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Wiring bean references @Value("#{pricingService}") private PricingService pricingService; ...or... <property name="pricingService" value="#{pricingService}" /> Don’t do this! However... SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Selective bean wiring SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Selective bean wiring @Value("#{systemProperties['PRICING'] == 'aggressive'" + "? aggressivePricing : regularPricing}") private PricingService pricingService; SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Selective collection wiring SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Selective collection wiring public interface TaxRule { boolean appliesToState(String state); double calculateTax(double base); } SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Selective collection wiring <util:list id="taxRules"> public interface TaxRule { <ref id="revenueTax" /> boolean appliesToState(String state); <ref id="carpetTax" /> double calculateTax(double base); <ref id="existenceTax" /> } <ref id="justBecauseTax" /> </util:list> SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Selective collection wiring <util:list id="taxRules"> public interface TaxRule { <ref id="revenueTax" /> boolean appliesToState(String state); <ref id="carpetTax" /> double calculateTax(double base); <ref id="existenceTax" /> } <ref id="justBecauseTax" /> </util:list> <bean id="taxProcessor" class="TaxProcessor" scope="session"> <aop:scoped-proxy /> <property name="taxRules" value= "#{taxRules.?[appliesToState(session.getAttribute('user').state)]}" /> </bean> SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Parting thoughts 38 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Parting thoughts • SpEL expressions are great for doing Spring configuration magic 38 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Parting thoughts • SpEL expressions are great for doing Spring configuration magic • SpEL expressions are just Strings...no compile- time help to ensure type-safety, syntax, etc. 38 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Parting thoughts • SpEL expressions are great for doing Spring configuration magic • SpEL expressions are just Strings...no compile- time help to ensure type-safety, syntax, etc. • Don’t abuse SpEL 38 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Parting thoughts • SpEL expressions are great for doing Spring configuration magic • SpEL expressions are just Strings...no compile- time help to ensure type-safety, syntax, etc. • Don’t abuse SpEL – Remember Goethe’s Sorcerer’s Apprentice 38 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Parting thoughts • SpEL expressions are great for doing Spring configuration magic • SpEL expressions are just Strings...no compile- time help to ensure type-safety, syntax, etc. • Don’t abuse SpEL – Remember Goethe’s Sorcerer’s Apprentice – A little bit of magic in the wrong hands can be dangerous 38 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Parting thoughts • SpEL expressions are great for doing Spring configuration magic • SpEL expressions are just Strings...no compile- time help to ensure type-safety, syntax, etc. • Don’t abuse SpEL – Remember Goethe’s Sorcerer’s Apprentice – A little bit of magic in the wrong hands can be dangerous • Write tests!!! 38 SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.
    • Q&A Thank you! Don’t forget to turn in your evaluations!!! SpringOne 2GX 2009. All rights reserved. Do not distribute without permission.