Getting Started > Getting Started with Windchill+ Deployment > Windchill+ Guidelines and Guardrails > Allowed Customization
Allowed Customization
The following table lists the elements that are allowed for use in customization. However, it is your responsibility to manage the customized files.
Element
Details
Windchill classes
Windchill classes can be used in customization, except those listed in Disallowed Customization.
* 
For official guidance on restricted usage of Windchill classes, refer to Supported and Nonsupported Usage of the API.
Java packages
Java packages can be used in customization, except those listed in Disallowed Customization. For certain packages, usage is further restricted—only the explicitly approved classes and methods listed in Allowed Classes in Java Packages can be used.
• org.json
• java.io
• java.net
• java.net.http
• java.nio
• java.security
• java.sql
• javax.net.ssl
• jakarta.servlet
* 
The java.nio.MappedByteBuffer class in the java.nio package is disallowed for use in customization. Other classes from this package are allowed.
Third-party jars
• poi.jar
• poi-ooxml.jar
• org.apache.olingo-odata-commons-api.jar
• org.apache.olingo-odata-server-api.jar
• openpdf.jar
• commons-lang3.jar
• commons-collections4.jar
• json.jar
• wex.kernel.jar (Support for Wincom Extensions)
Only the following API is allowed from this JAR:
com.wincomplm.wex.kernel.api.invoke.WexInvoker.invoke
• com.fasterxml.jackson
Only the following APIs are allowed from this JAR:
◦ com.fasterxml.jackson.core.JsonProcessingException.toString
◦ com.fasterxml.jackson.core.type.TypeReference.TypeReference()
◦ com.fasterxml.jackson.databind.JsonNode.asInt
◦ com.fasterxml.jackson.databind.JsonNode.asLong
◦ com.fasterxml.jackson.databind.JsonNode.asText
◦ com.fasterxml.jackson.databind.JsonNode.equals
◦ com.fasterxml.jackson.databind.JsonNode.get
◦ com.fasterxml.jackson.databind.JsonNode.isEmpty
◦ com.fasterxml.jackson.databind.JsonNode.spliterator
◦ com.fasterxml.jackson.databind.JsonNode.toPrettyString
◦ com.fasterxml.jackson.databind.JsonNode.toString
◦ com.fasterxml.jackson.databind.JsonNode.isArray()
◦ com.fasterxml.jackson.databind.JsonNode.iterator()
◦ com.fasterxml.jackson.databind.node.ArrayNode.add
◦ com.fasterxml.jackson.databind.node.ArrayNode.get
◦ com.fasterxml.jackson.databind.node.ArrayNode.iterator
◦ com.fasterxml.jackson.databind.node.ArrayNode.remove
◦ com.fasterxml.jackson.databind.node.ArrayNode.size
◦ com.fasterxml.jackson.databind.node.ObjectNode.get
◦ com.fasterxml.jackson.databind.node.ObjectNode.has
◦ com.fasterxml.jackson.databind.node.ObjectNode.iterator
◦ com.fasterxml.jackson.databind.node.ObjectNode.put
◦ com.fasterxml.jackson.databind.node.ObjectNode.size
◦ com.fasterxml.jackson.databind.node.ObjectNode.put(java.lang.String~ java.lang.Boolean)
◦ com.fasterxml.jackson.databind.node.ObjectNode.put(java.lang.String~ java.lang.String)
◦ com.fasterxml.jackson.databind.node.ObjectNode.set(java.lang.String~ com.fasterxml.jackson.databind.JsonNode)
◦ com.fasterxml.jackson.databind.node.ObjectNode.toString()
◦ com.fasterxml.jackson.databind.ObjectMapper.configure
◦ com.fasterxml.jackson.databind.ObjectMapper.convertValue
◦ com.fasterxml.jackson.databind.ObjectMapper.enable
◦ com.fasterxml.jackson.databind.ObjectMapper.readTree
◦ com.fasterxml.jackson.databind.ObjectMapper.readValue
◦ com.fasterxml.jackson.databind.ObjectMapper.writerWithDefaultPrettyPrinter
◦ com.fasterxml.jackson.databind.ObjectMapper.createArrayNode()
◦ com.fasterxml.jackson.databind.ObjectMapper.createObjectNode()
◦ com.fasterxml.jackson.databind.ObjectMapper.getTypeFactory()
◦ com.fasterxml.jackson.databind.ObjectMapper.ObjectMapper()
◦ com.fasterxml.jackson.databind.ObjectMapper.readTree(java.io.Reader)
◦ com.fasterxml.jackson.databind.ObjectMapper.readTree(java.lang.String)
◦ com.fasterxml.jackson.databind.ObjectMapper.readValue(java.io.Reader~ com.fasterxml.jackson.core.type.TypeReference)
◦ com.fasterxml.jackson.databind.ObjectMapper.readValue(java.lang.String~ com.fasterxml.jackson.databind.JavaType)
◦ com.fasterxml.jackson.databind.ObjectMapper.readValue(java.lang.String~ java.lang.Class)
◦ com.fasterxml.jackson.databind.ObjectMapper.treeToValue(com.fasterxml.jackson.core.TreeNode~ java.lang.Class)
◦ com.fasterxml.jackson.databind.ObjectMapper.valueToTree(java.lang.Object)
◦ com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(java.lang.Object)
◦ com.fasterxml.jackson.databind.type.TypeFactory.constructCollectionType(java.lang.Class~ java.lang.Class)
◦ com.fasterxml.jackson.databind.ObjectWriter.writeValueAsString
◦ com.fasterxml.jackson.dataformat.xml.XmlMapper.configure
◦ com.fasterxml.jackson.dataformat.xml.XmlMapper.readValue
◦ com.fasterxml.jackson.dataformat.xml.XmlMapper.XmlMapper
OOTB file-based configurations provided by PTC
* 
Never overwrite the OOTB files. Always create a copy of the file and then modify it. However, the following files are an exception, you can overwrite them.
• codebase/com/ptc/coversheet/basic/tpl/ddxDirective.xml
• codebase/com/ptc/windchill/enterprise/nativeapp/msoi/client/xml/wtDesktop.xml
• codebase/com/ptc/windchill/enterprise/nativeapp/msoi/client/xml/wtOffice.xml
• codebase/com/ptc/windchill/enterprise/nativeapp/msoi/client/xml/wtWindows.xml
• codebase/com/ptc/windchill/enterprise/nativeapp/msoi/server/msoimap.xml
• conf/auditing/configAudit.xml
• conf/securityLabelsConfiguration.xml
• codebase/com/ptc/arbortext/windchill/serviceEffectivityFilter/server/serviceEffectivityConfig.xml
• codebase/com/ptc/core/collectionsrv/config/SampleConfigurableLinksCollectionExecutionOrder.xml
• codebase/com/ptc/core/collectionsrv/config/SampleConfigurableLinksCollectionDefinitions.xml
• codebase/pickerAttributes.xml
• codebase/registry/ixb/handlers/actor.xml
• codebase/com/ptc/arbortext/windchill/siscore/attset/xml/localizable_attset.xml
• codebase/com/ptc/odata/core/odata.properties
• conf/exposedSecurityLabelObjects.xml
• conf/downloadAcknowledgementTypes.xml
• codebase/com/ptc/arbortext/windchill/publisher/update/overridable_ruleset.xml
• codebase/com/ptc/arbortext/windchill/siscore/attset/xml/publishable_attset.xml
• codebase/com/ptc/arbortext/windchill/siscore/attset/xml/referencedobjects_attset.xml
• codebase/com/ptc/arbortext/windchill/siscore/attset/xml/publishinfo_attset.xml
• codebase/com/ptc/arbortext/windchill/siscore/attset/xml/manifest_attset.xml
• codebase/config/urlValidators/custom-validators.xml
• codebase/registry/ixb/mapping/IXMappingConfiguration.xml
• codebase/config/mvc/custom.xml
Outbound HTTPS calls
HTTPS calls to external systems
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